Poultry diseases / Causes, symptoms and treatment, with notes on post-mortem examinations
Date: 2022-02-21T00:00:00+00:00
Keywords: Poultry -- Diseases

The Project Gutenberg eBook of Poultry diseases

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Title: Poultry diseases

Author: E. J. Wortley

Release date: February 21, 2022 [eBook #67465]
Most recently updated: October 18, 2024

Language: English

Original publication: United States: Orange Judd company, 1915

Credits: Bryan Ness, Les Galloway and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.)

*** START OF THE PROJECT GUTENBERG EBOOK POULTRY DISEASES ***

Transcriber’s Notes

Obvious typographical errors have been silently corrected. Variations in hyphenation and accents have been standardised but all other spelling and punctuation remains unchanged.

Profit or loss

POULTRY DISEASES

Causes
Symptoms
and Treatment
With Notes on
Post-Mortem Examinations

E. J. WORTLEY, F. C. S.

Illustrated

NEW YORK
ORANGE JUDD COMPANY
1915
LONDON
KEGAN PAUL, TRENCH, TRÜBNER & CO., Limited

Copyright, 1915, by
ORANGE JUDD COMPANY
All Rights Reserved

Entered at Stationers’ Hall
LONDON, ENGLAND

Printed in U. S. A.

PREFACE

Poultry farming as a means of profit can be made successful only by maintaining the most vigorous and sustained campaign against disease. The aim of the poultry rearer should be to stamp out disease by preventive measures. Practical experience proves the inefficiency of many so-called cures, and points to the urgency of poultrymen endeavoring to understand more thoroughly the causes of the ailments to which domestic fowls are liable.

My aim is to put a concise handbook into the hands of poultry rearers, who should thus be assisted in determining the various diseases and in taking the precautionary steps important in preventing the introduction and spread of contagious diseases. No effort is made to elaborate the scientific side of the subject. Those desirous of obtaining full information about the types of organisms that have been proved to be the specific causes of, or to be invariably associated with, particular disorders, may do so with profit by obtaining fuller works on the subject. Many scientific workers are devoting their time to the problem of combating diseases among poultry, and assistance is willingly given by officers of the experiment stations to farmers who desire to identify any disease causing loss in their flocks.

The practical poultryman will recognize the fact that measures for the control of disease cannot be limited to sanitation and the treatment of sick birds, but, in reality, include such important matters as the selection of healthy stock, intelligent feeding, proper housing, and other details essential to the successful management of poultry.

I gratefully acknowledge my indebtedness to the works of Dr. D. E. Salmon and John H. Robinson, editor of Farm Poultry, and to the recent publication on poultry diseases by Dr. Raymond Pearl, Frank M. Surface, and Maynie R. Curtis. My thanks are due to R. S. Martinez for the care taken in making the photographs from which the drawings for the illustrations in the chapter on Post-Mortem Examinations were prepared. Much valuable information has also been obtained from bulletins issued by the experiment stations of the United States and by the Ontario Agricultural College of Canada.

E. J. Wortley.

CONTENTS

| | PAGE
CHAPTER I
General Methods of Controlling Disease | 1
| 1. Importance of controlling disease.
| 2. Dangers of introducing disease.
| 3. Control measures.
| 4. Nursing sick birds.
| 5. The use of drugs and medicines.
| 6. Disinfection.
CHAPTER II
Summary of External Symptoms and Treatment | 14
| 1. Diseases affecting head and respiratory organs.
| 2. Diseases affecting organs of digestion and reproduction.
| 3. Diseases affecting legs and feet.
| 4. Parasites.
| 5. Miscellaneous.
CHAPTER III
Diseases of Poultry Other Than Fowls | 19
CHAPTER IV
Diseases and Pests of Fowls | 22
| (In alphabetical order.)
CHAPTER V
Post-Mortem Examinations | 99
| 1. Making the examination.
| 2. The normal condition of the internal organs.
| 3. Diagnosis of disease by post-mortem symptoms.

LIST OF ILLUSTRATIONS

FIG. | | PAGE
| Profit or Loss | Frontispiece
2 | Isolation | 5
3 | Desolation | 6
4 | Poultryman’s Medicine Shelves | 8
5 | How Disease Is Spread | 10
6 | Aids to Thorough Disinfection | 12
7 | Head Showing Brain Exposed | 29

8

Windpipe Cut Open
A Fungus That Causes Aspergillosis

30

9 | Bumblefoot | 36
10 | Chicken Pox | 38
11 | Diphtheritic Roup | 50

12

Chicken Affected with Gapes
Gape Worms

60

13 | Looking for Lice | 67
14 | Three Lice That Commonly Affect Fowls | 68
15 | The Air-Sac Mite | 74
16 | The Depluming Mite | 74
17 | The Red Mite | 75
18 | Organs of Reproduction of the Hen | 78
19 | Examining a Fowl with a Suspicious Cold | 84
20 | A Roupy Eye | 87
21 | Scaly Leg | 88
22 | The Mite That Causes Scaly Leg | 89
23 | The Fowl Tick | 90
24 | Organs Affected by Tuberculosis and Blackhead | 91
25 | Chickens Affected with White Diarrhea | 93
26 | Healthy Chickens | 93
27 | Worms in Intestinal Tract of Fowl | 95
28 | The Parts of a Fowl | 96
29 | Skeleton of a Fowl | 97
30 | Post-Mortem Examination No. 1 | 100
31 | Post-Mortem Examination No. 2 | 102
32 | Post-Mortem Examination No. 3 | 104
33 | Post-Mortem Examination No. 4 | 106
34 | Post-Mortem Examination No. 5 | 110

CHAPTER I
General Methods of Controlling Disease

1. Importance of Controlling Disease

The ravages of disease add considerably to the difficulties of raising poultry in all parts of the world. It is the experience of poultry rearers that an annual toll has to be paid in the lives of young birds and older stock. Sooner or later, in addition, an epidemic may break out and result in heavy losses and much discouragement.

It is most important, therefore, to be able to recognize the symptoms and to know the causes of the many diseases to which various kinds of poultry are subject. Every practical effort should be made to reduce avoidable mortality. An unexplained death should be regarded with concern. It may point to the presence of a serious disease. When there is not sufficient external evidence for determining the cause of death, a post-mortem examination should be made (see page 98).

The poultryman must know above all whether he is dealing with an infectious disease or not. The discovery that a sudden death among his fowls is due to apoplexy will set his mind at ease. On the other hand, if a case of cholera occurs, the body of the dead fowl should be burnt, and a vigorous campaign started to prevent the spread of the disease; birds showing mopishness and other suspicious symptoms should be isolated; the houses, the feed troughs, the water vessels, and the yard to which the dead fowl has had access, should all be thoroughly disinfected.

2. Dangers of Introducing Disease

Perhaps more loss has been caused by introducing birds with disease into a healthy flock than by any other means. Readers will, doubtless, be able to recall occasions on which their own, or their neighbors’, flocks suffered. An instance was recently related to the writer. A poultryman was offered two fowls, which he at first refused, but owing to the vagrant seller’s importunity, he eventually bought the birds and let them loose among the home flock. On the following day one died; but no effort was made to discover the cause, nor was the dead fowl’s body burnt. In a few days, a fowl belonging to the original flock died and, in three to four weeks after the purchase, two-thirds of the stock had died. It afterwards transpired that the vendor had lost several of his fowls from cholera, and the fear of further mortalities had been his reason for being so anxious to dispose of the survivors.

On every farm where poultry is kept, there should be a quarantine ward for new purchases. The most careful breeders will isolate their own birds that have returned from an exhibition, for fear they may have contracted some disease there or on the journey.

3. Control Measures

Practical experience and scientific investigation have clearly proved that preventive measures are more economical and effective than curative. Failing prevention, everything points to the importance of dealing promptly with the first cases, owing to the risk of infection of the rest of the stock. Control measures may be divided into three classes:

1. Proper housing and feeding of fowls.

2. General sanitation and disinfection.

3. Administration of medicine to sick birds.

The details to which special attention must be given are covered by the following axiomatic rules:

1. Isolate birds recently purchased—for two or three weeks.

2. Isolate every bird that shows any sign of ill health.

3. Provide a fresh and pure supply of water in a shady position.

4. Add Epsom salts (one teaspoonful to a quart) once a week to the drinking water. Give chickens daily a liberal supply of bran in addition to their other food.

5. Feed birds on a varied diet, including green food.

6. Arrange that birds have to scratch for some of their food.

7. Construct houses, nest boxes, etc., so that they can be readily and thoroughly disinfected. Houses should be free from drafts.

8. Disinfect contaminated soil by spraying, liming, and resting.

9. Visit the roosts at night to detect cases of wheezing due to colds, and to search for mites and other pests.

10. Keep on hand disinfectants, lice powders and medicines likely to be required.

4. Nursing Sick Birds

Fig. 2.—ISOLATION

The small margin of profit on a single fowl makes dosing with medicines and nursing an unprofitable occupation, except in the case of valuable stock. If the treatment of a bird is undertaken, it should be borne in mind that more depends upon attention to the rules of good nursing than to the administration of drugs. Comfortable quarters, warm and free from drafts, clean straw, and invalid’s diet of soft and easily digested food will all turn the chances in favor of recovery.

Fig. 3.—DESOLATION

Too often isolation is in effect a death sentence. The bird is put into cramped quarters, exposed to cold winds and beating rains, and, being in an out-of-the-way corner, is, perhaps, neglected instead of being specially cared for.

Fowls that will not take food should be fed lightly, but frequently, with a spoon in order that their strength may be kept up. All stale food should be removed.

5. The Use of Drugs and Medicines

Drugs and medicines likely to be required should always be kept in stock. The weekly use of Epsom salts, as a mild laxative for preventing intestinal disorders, is strongly recommended. Little faith should be put in drugs said to cure tuberculosis, cholera, etc. Below is given a list of the medicines generally required. The doses given in the table are for a medium-sized adult fowl; three-quarters as much should be given for a half-grown bird, and about one-fifth for a young chicken. Treatment should be repeated as necessary, and animals should be well nursed.

Fig. 4.—POULTRYMAN’S MEDICINE SHELVES

Medicine | Dose or Strength | Disease

Stimulants—

Brandy | 3-10 drops in warm milk

Aperients—

Calomel | 1 grain | Diarrhea; liver disease.
Castor oil | 1 teaspoonful | Diarrhea.
Epsom salts | 20 grains to 50 grains in food or warm water | Constipation; diarrhea; liver disease.

Astringents—

Chlorodyne | 6-12 drops | Diarrhea; dysentery.
Laudanum (relieves pain) | 4-6 drops | Diarrhea; dysentery.

Tonic and Febrifuge—

Quinine | 1 grain | Colds; fever; roup.
Aconite | 1 drop | Colds; fever; roup.

For Worms—

Turpentine | 5 to 10 drops in 1 teaspoonful castor oil | Worms (intestinal).
Santonin | 3 to 5 grains | Worms (intestinal).

Antiseptic Washes—

(a) Carbolic acid | 1-5% sol. |
(b) Hydrogen peroxide | 50% | } Colds; roup; diphtheria; cuts and injuries.
(c) Creolin | 2-5% sol.
(d) Permanganate of potash | 1/2-2% sol.

Dressing Flesh Wounds—

1/2 creolin and 1/2 sweet oil | | Cuts and injuries.

To Reduce Swellings—

Iodine | Tincture | Cramp; Rheumatism.
Embrocation: |
Turpentine | 10 drops | Cramp; Rheumatism.
Sweet oil | 1 ounce

Insecticides—

Lice powders | | Lice, mites.
Kerosene | | Scaly legs.
Sulphur ointment: | | Lice, scaly legs, mites, ticks.
Sulphur | 1 part
Kerosene | 1 part
Lard | 2 parts

Note.—By accepting that 1¼ teaspoonfuls made up to a pint with water gives approximately a 1% solution, any of the weak dilutions required by poultrymen can be easily prepared.

6. Disinfection

Fig. 5.—HOW DISEASE IS SPREAD
Germs of tuberculosis in the excrement of a fowl. (After Edwards.)

The important part played by micro-organisms in causing and spreading disease must be understood before the value of disinfection can be fully appreciated. The poultryman must develop a sense of sight that sees lurking microbes at every turn, especially in unclean corners. Figure 5 shows germs revealed by the microscope in the excrement of a bird suffering from tuberculosis. The fact that this speck contained so many germs, although it was far too small to be seen with the naked eye, will give an idea of how epidemics may be caused by food, water, and soil contaminated by excreta, nasal discharges, etc.

Regular and thorough disinfection of woodwork, of feeding vessels, and of the drinking water should form part of the routine of poultry management, and a stock of disinfectants should always be kept on hand. It will be found convenient to have an iron drum with a tap for a diluted solution, say 5%, of some standard disinfectant—e. g., creolin—that can be further diluted as required.

Water. A stock solution of permanganate of potash, made by adding ten grains to one quart of water, should always be kept on hand for purposes of disinfection. When there is danger of infection, two tablespoonfuls of this solution should be added to every gallon of drinking water.

Feeding Vessels. Clean with boiling water.

Fig. 6.—AIDS TO THOROUGH DISINFECTION

Houses and Fixtures. Spray with 2% to 5% creolin (or other disinfectant) and whitewash afterwards, or use whitewash to which 2% of creolin has been added. The whitewash should be prepared with quick-lime. The house should first be cleaned out with an iron scraper and scrubbing brush, using a liberal supply of water (see Fig. 6).

Soil. The most convenient of the following methods should be adopted:

(1) Spray surface with 5% creolin.

(2) Spread straw over ground and set fire to it.

(3) Fork over and lime. This method is not sufficient if serious contamination is suspected.

CHAPTER II
SUMMARY OF EXTERNAL SYMPTOMS AND TREATMENT

Disease | External Symptoms | Treatment
1. Diseases affecting head and respiratory organs: |
Air under skin (see Emphysema). |
Apoplexy | Staggering gait and appearances of a sudden fit | Keep fowl quiet; put in a dark place; give Epsom salts.
Aspergillosis | Loss of weight | Avoid musty grain and straw.
Brooder pneumonia | Affects chickens; whitish diarrhea; many deaths | No cure; prevent by strict sanitary methods.
Bronchitis (croup) | Rattling in throat | Paint throat with iodine.
Canker (see Roup). |
Catarrh, contagious (see Roup). |
Chicken pox | Scabby, wart-like growths on head and comb | Gently scrape off scab and paint withiodine.
Cold (catarrh) | Running at nose and eyes | Isolate and syringe nostrils with 2% carbolic acid.
Congestion of lungs (see Pneumonia). |
Conjunctivitis—sore eyes (see Roup). |
Diphtheria (diphtheritic roup) | Yellowish patches on throat following an attack of roup | Isolate; paint patches with hydrogen peroxide or iodine; best to kill fowl.
Emphysema | Skin puffed out | Puncture with needle.
Epilepsy | Bird has fit | If worms are believed to be the cause give santonin.
Favus | Scurfy patches on comb and upper portion of neck | Anoint with sulphur ointment or iodine.
Frost bite | Frozen wattles | Rub with vaseline.
Influenza—grippe (see Cold). |
Roup | Nostrils caked with offensive smelling exudate | Isolate; syringe nostrils with 5% carbolic acid; best to kill fowl with bad attack.
Pip | Hardened scale on tip of tongue | Soften and remove.
Pneumonia | Great difficulty in breathing | Paint shoulders above lungs with iodine; generally incurable.
Sore head (See Chicken pox). |
Vertigo (see Epilepsy). |
White comb (see Favus). |
2. Diseases affecting organs of |
digestion and reproduction: |
Blackhead of turkeys | Drooping wings; dullness; many deaths | Strict sanitary measures; difficult to control.
Cancer (see Liver diseases and Ovary diseases). |
Catarrh of crop | Distended crop with offensive liquid | Empty crop; diet sparingly.
Catarrh of stomach (see Gastritis). |
Cholera | Yellow feces; bad diarrhea; sudden death of several birds | No cure known; kill fowl and burn body; take every precaution to prevent spread.
Cloacitis | Offensive discharges from cloaca | Syringe out cloaca.
Constipation | Unsuccessful efforts to evacuate | Give castor oil; supply green food and make bird scratch for grain.
Coccidiosis of adult fowls | Loss of weight, diarrhea | No remedies.
Coccidiosis of chickens (see White diarrhea). |
Coccidiosis of turkeys (see Blackhead). |
Crop-bound | Distended crop | Pour sweet oil down throat and knead crop, holding fowl’s head down; or slit crop and remove food.
Diarrhea | Frequent passing of liquid excreta; soiled vent | Isolate for fear of epidemics; in bad cases give 6 to 10 drops chlorodyne.
Dropsy | Distention of abdomen | Kill bird or puncture abdomen.
Dysentery | Bad form of diarrhea distinguished by blood in the excreta | Treat as for bad cases of diarrhea.
Egg-bound | Unsuccessful efforts to lay | Remove egg.
Enteritis (see Diarrhea). |
Fatty degeneration | Sudden death; excessively fat | Change diet of others.
Fowl typhoid (see Cholera). |
Gastritis | Dullness; loss of appetite | Empty stomach; give castor oil and easily digested food.
Impaction of crop (see Crop-bound). |
Indigestion | Difficult to diagnose | Change diet.
Jaundice | Yellowish comb | One grain of calomel and green food.
Leukemia (see Cholera). |
Liver diseases | Difficult to diagnose | Change diet.
Ovary diseases | Irregularity in egg production | No remedies.
Oviduct diseases | Prolapse of oviduct | Vaseline and replace.
Peritonitis | Fever; pain in abdomen | Aconite and opium.
Pyæmia | No external symptoms | No remedy.
Soft crop | Distended and soft crop | Empty crop; diet sparingly.
Tuberculosis | Wasting away; lameness | Kill affected birds; disinfect poultryhouses, etc.
White diarrhea of chickens | Dullness; many deaths; whitish diarrhea | Proper feeding; thorough disinfection; difficult to control.
3. Diseases affecting legs and feet: |
Bumblefoot | Swelling on pad of foot | Lance, if bad; paint with iodine; lower perches.
Cramp | Difficulty in standing straight | Hold legs in warm water; rub with embrocation; keep bird in dry place.
Fractures | Broken shank or wing | Splints.
Gout | Pain in joints of legs and difficulty in standing | Difficult to cure; rub joints with embrocation.
Leg weakness | Unsteady walk | Select breeders.
Rheumatism | Stiffness in joints; difficult to distinguish from cramp and gout | Rub legs with embrocation; keep bird in dry place.
4. Parasites: |
Fleas | On hen and in nest straw | Dust with insect powder; burn infested straw.
Gape worms | Gaping of chicks and effort to dislodge something in throat or windpipe | Extract by pushing feather moistened with turpentine down windpipe.
Lice | Unthrifty condition of birds; desertion of nests by setting hens | Dust fowl with insect powder; grease head and neck of chickens; spray woodwork.
Maggots | Running wound | Remove maggots; treat with creolin or carbolic acid.
Mites (air sac) | In bad cases, suffocation | Difficult to treat.
Mites (depluming) | Bare patches | Sulphur ointment.
Mites (red) | Examine roosts at night | Kerosene.
Scabies (see Mites, depluming). |
Scaly leg | Uneven crusts on legs | Scrub with soap and water; kerosene oil or sulphur ointment.
Ticks | Birds suffering from fever; ticks found on the body, especially at night | Remove ticks from fowl; spray perches, etc., with 5% creolin.
Worms | Loss of weight; segments of worms in excreta | Give 3 to 5 grains santonin, followed by 2 teaspoonfuls castor oil.
5. Miscellaneous: |
Abscesses | Swelling with pus | Lance and dress with healing oil.
Anæmia | Loss of weight and unthrifty condition | Search for cause and treat.
Breakdown | Enlarged and pendulent abdomen | No satisfactory treatment.
Egg-eating | Remains of eggs | Trap nests.
Feather-eating | Injured plumage | Isolation of culprit.
Going light (see Anæmia). |
Heart, diseases of | No external symptoms | No treatment possible.
Limber-neck | Muscles of neck unable to support head | Try purgative to correct cause.
Kidney diseases | No external symptoms except in gout | No treatment except for gout.
Molting | Unthrifty condition of bird | Feed up and give tonic.
Poisoning | Evidence of pain and depression | Give milk, white of egg and a stimulant.

CHAPTER III
Diseases of Poultry Other Than Fowls

All classes of domestic poultry are to a great extent subject to the same diseases that affect the common fowl. The symptoms of such diseases are for the most part similar to those noticed when fowls are affected, and treatment must be on the same lines. In the management of turkeys, ducks, geese, guinea fowls and pigeons, the strictest sanitary measures must be enforced, as in the rearing of fowls.

Owing to its importance, blackhead of turkeys is dealt with separately. It is one of the most serious of poultry diseases and causes heavy losses to turkey rearers. Careful study should be made of the reports of the recent investigations at the Rhode Island Experiment Station.

Severe epidemics of diarrhea or cholera occur among all classes of poultry. Geese are subject to a form of cholera that appears to be different from any kind that attacks fowls. Water fowl are not commonly infested with external parasites. Pigeons, on the other hand, are worried by fleas and ticks as well as mites. Smallpox of pigeons is similar to chicken pox of fowls, but pustular swellings may be found on the rump and the cloaca of the pigeon as well as on the head. The scaly leg mite attacks turkeys and the gape worm is sometimes a serious pest of poults. Below is given a list of some of the diseases of turkeys, ducks, geese, guinea fowls and pigeons:

TURKEYS

- Blackhead
- Diphtheria
- Gapes
- Leg weakness
- Lice
- Mites
- Roup
- Tuberculosis
- Scaly leg
- White comb
- Worms

DUCKS

- Aspergillosis
- Catarrh
- Congestion of lungs
- Cholera
- Diphtheria
- Lice
- Mites
- Worms

GEESE

- Aspergillosis
- Cholera
- Congestion of lungs
- Diphtheria
- Lice
- Mites
- Worms

GUINEA FOWLS

- Aspergillosis
- Cholera
- Diphtheria
- Lice
- Mites
- Worms

PIGEONS

- Aspergillosis
- Canker
- Chicken pox (smallpox)
- Diphtheria
- Dovecot bug
- Flea
- Lice
- Mites
- Ticks
- Worms

CHAPTER IV
Diseases and Pests of Fowls

- Abscesses.

- Abnormal eggs (see Oviduct diseases).

- Air under skin (see Emphysema).

- Air sac mite (see Mites, air sac).

- Anæmia.

- Apoplexy.

- Aspergillosis.

- Atrophy of liver (see Liver diseases).

- Bacterial enteritis (see Diarrhea)

- Baldness (see Favus).

- Biliary repletion (see Jaundice).

- Blackhead of turkeys.

- Breakdown.

- Broken limbs (see Fractures).

- Bronchitis.

- Brooder pneumonia.

- Bumblefoot.

- Cancer (see Liver diseases and Ovary diseases).

- Canker (see Diphtheria).

- Catarrh (see Cold).

- Catarrh, contagious (see Roup).

- Catarrh of crop.

- Catarrh of stomach (see Gastritis).

- Chicken pox.

- Cholera.

- Cloacitis.

- Coccidiosis of adult fowls.

- Coccidiosis of chickens (see Brooder pneumonia).

- Coccidiosis of turkeys (see Blackhead).

- Cold.

- Congestion of the liver (see Liver diseases).

- Congestion of the lungs (see Pneumonia).

- Conjunctivitis (see Roup).

- Constipation.

- Cramp.

- Crop-bound.

- Crop, soft (see Soft crop).

- Crop, Catarrh of.

- Depluming mite.

- Diarrhea, bacterial.

- Diarrhea, mycotic.

- Diarrhea, protozoan.

- Diarrhea, simple.

- Diarrhea, severe.

- Diarrhea, white.

- Diphtheria.

- Diphtheritic roup.

- Dislocations (see Fractures).

- Dropsy.

- Dysentery.

- Egg-bound.

- Egg-eating.

- Emphysema.

- Enlargement of heart (see Heart, diseases of).

- Enlargement of liver (see Liver diseases).

- Enlargement of kidneys (see Kidney diseases).

- Enteritis (see Diarrhea).

- Entero-hepatitis (see Blackhead).

- Epilepsy.

- Fatty degeneration.

- Favus.

- Feather-eating.

- Fits (see Epilepsy).

- Fleas.

- Fowl typhoid.

- Fractures.

- Frost bite.

- Gangrenous Ovary (see Ovary diseases).

- Gapes.

- Gastritis.

- Going light (see Anæmia).

- Gout.

- Grippe (see Cold).

- Heart, diseases of.

- Heart, dropsy of.

- Heart, enlargement of.

- Heart, rupture.

- Hypertrophy of the liver (see Liver diseases).

- Impaction of the crop (see Crop-bound).

- Indigestion.

- Influenza (see Cold).

- Jaundice.

- Kidney diseases.

- Leg weakness.

- Leukemia (see Cholera).

- Lice.

- Limber-neck.

- Liver diseases.

- Lungs, congestion of (see Pneumonia).

- Maggots.

- Mites, air sac.

- Mites, depluming.

- Mites, red.

- Mites, scaly leg (see Scaly leg).

- Molting.

- Nodular tæniasis (see Worms).

- Ovary diseases.

- Oviduct diseases.

- Peritonitis.

- Pip.

- Pneumonia.

- Poisoning.

- Prolapse of oviduct (see Oviduct diseases).

- Puffed skin (see Emphysema).

- Pyæmia.

- Rheumatism.

- Roup.

- Scabies (see Mites, depluming).

- Scaly leg.

- Soft crop.

- Sore head (see Chicken pox).

- Ticks.

- Tuberculosis.

- Vertigo (see Apoplexy).

- White comb (see Favus).

- White diarrhea of chickens.

- Worms.

ABSCESSES
Not a common poultry complaint

Symptoms. The flesh becomes inflamed and swollen and forms a “head” containing pus.

Cause. A scratch or a small injury followed by inflammation due to pus-forming organisms.

Treatment. Lance the abscess when “ripe” with a clean, sharp knife, cutting low so that the sore may drain readily. Squeeze out the pus; wash with 1% carbolic acid or creolin and dress with creolin and sweet oil (half and half) until healed.

The most common abscess is that which forms on the pad of the foot and develops into bumblefoot.

ANÆMIA, OR GOING LIGHT
A condition that should incite the poultryman to investigate the cause

Symptoms. Birds lose weight, or ”go light,” without any apparent reason.

Cause. A general lack of thriftiness in the flock may be due to insufficient or poor food, to lack of exercise, or to bad ventilation of houses; lice or mites may be infesting the birds. On the other hand, birds may gradually lose weight as the result of some such disease as tuberculosis (see page 90}, aspergillosis (see page 29), or worms (see page 94).

Treatment. Make any changes in feeding or management that may appear desirable. Search at night for mites or lice on the birds; in the daytime examine the straw in nest boxes, the roosts, and the cracks and crevices of the woodwork for parasites. Much time may often be saved in discovering what is wrong with the flock by killing one or more of the affected birds and making a post-mortem examination to discover if a specific disease is the cause.

APOPLEXY
Not a common trouble

Symptoms. Staggering gait and bewildered appearance; bird generally drops dead suddenly.

Cause. Attributed to high feeding or over-laying.

Treatment. There is usually no time for treatment, but if the attack is mild, put the bird in a dark place and give no food for a few hours; give a dose of Epsom salts and add green food to diet. Bleeding from under a wing is sometimes tried.

Post-mortem examination shows clotted blood on the brain, the other organs being normal.

The name vertigo is applied to congestion of the brain as distinct from apoplexy due to hemorrhage of the brain. The fowl has fits. It is difficult to distinguish this disease from epilepsy (see page 55). The cause is little understood.

Fig. 7.—Head Showing Brain Exposed

ASPERGILLOSIS
A disease that exists more commonly than is usually suspected, and is the cause of the death of large numbers of young chickens

Symptoms. Fowls gradually lose weight, mope, and die without any pronounced ailment except difficulty in breathing. In adults the disease may be mistaken for tuberculosis and in chickens for white diarrhea. Aspergillosis of chickens is dealt with under brooder pneumonia. Post-mortem symptoms are whitish or yellowish growths on the windpipe, that can only be definitely diagnosed under the microscope.

Cause. A fungoid growth in the windpipe and bronchial tubes, sometimes extending to the lungs and liver. Fig. 8 shows the spores and filaments of the species of aspergillosis most commonly responsible for this disease. Infection may be due to musty grain or dirty straw.

Fig. 8.—ASPERGILLOSIS
On left—Windpipe cut open. On right—A fungus that causes aspergillosis

Treatment. No medicines are of any avail. Protection lies in not using musty grain or moldy litter. Burn dead birds.

BLACKHEAD OF TURKEYS
A very serious disease, making the successful rearing of turkeys difficult and in some cases impossible.

Symptoms. Young turkeys, or poults, are most commonly attacked; there is loss of weight and loss of appetite; the bird appears listless and stands by itself with drooping wings and tail. Diarrhea is generally one of the symptoms. The comb often turns a dark purple—a symptom that has given rise to the name blackhead. Death generally follows an attack fairly rapidly, but in some cases the disease may take a chronic form, while it is believed that recovery is occasionally effected.

Post-mortem symptoms. The cæca (see Fig. 32) are enlarged, are diseased in parts, and are more or less plugged with cheesy matter and pus. The liver is diseased, being sometimes very much enlarged and covered with yellowish necrotic areas, generally depressed in the centre (see Fig. 24d). In cases of an acute attack, especially in young birds, one of the cæca only may be affected and the liver may not be invaded. The extent of the necrotic areas and the degree of the enlargement of the infected organs may vary greatly in different cases.

Cause. The cause of blackhead has been shown by Drs. Cole and Hadley to be a coccidium. A full account of their work is published in Bulletin 141 of the Rhode Island Experiment Station. Coccidia enter the digestive tract of the healthy turkey by means of food or water infected by the excrement of a sick bird. The organisms pass along the alimentary canal until they reach the cæca, the lining of which they attack, giving rise to the conditions mentioned under post-mortem symptoms. How the infection spreads from the cæca to the liver is not clear.

It has been conclusively proved that fowls, as well as pigeons, sparrows, etc., act as hosts for these parasites. Although adult fowls have a great degree of resistance themselves, they are a means of carrying infection to turkeys.

Eggs may be one of the means of spreading the disease, as they may become contaminated in the oviduct or the cloaca of birds affected with blackhead.

Treatment. No remedy or satisfactory method of prevention has been discovered. The difficulty of effecting a cure is obvious when the nature of the disease is considered. Drs. Cole and Hadley summarize measures of prevention as follows:

1. Protect the yards and flocks which may have the good fortune to be uninfected with the blackhead organism by a thorough examination of all new stock, whether turkeys, fowls, geese or other domestic birds.

2. Keep the turkeys on grounds which are as fresh as can be obtained, and above all, keep them isolated from fowls and other domestic birds.

3. Keep every turkey in the flock under close observation in order to separate and at once isolate any bird which gives evidence of the disease. To facilitate such observations it is helpful to leg-band each individual, and to record its weight from time to time. Such a course makes it possible to learn whether any birds are losing weight, and if this is the case, these birds must be regarded with suspicion, and separated from the rest of the flock.

4. If it is known that blackhead is present in any of the poultry, the yard should be kept free from English sparrows, and the poultry houses and grain boxes from rats and mice, which have been shown to carry the causative organism.

5. When it is desired to fatten birds for the market, begin to increase the rations gradually. Never attempt to fatten birds which, in successive weighings, show a loss of weight. Overfeeding does not cause blackhead, but frequently causes the sudden death of birds in which blackhead is present.

6. When birds have died of blackhead, their bodies should be promptly burned or buried in order to prevent the dissemination of the coccidia, either through the ravages of rats or skunks, or consequent to the natural processes of decay.

BREAKDOWN
Not often seen in the poultry yard

Symptoms. The abdomen becomes enlarged, hangs down at the back, and sometimes touches the ground.

Cause. Old layers are generally affected. The cause may be the strain of heavy laying, or may in cases be due to too much internal fat.

Treatment. No satisfactory treatment can be recommended and the bird had best be killed. Such birds should not be used for breeding purposes.

BRONCHITIS (CROUP)
Not very common

Symptoms. Bronchitis may be distinguished by the rattling in the throat of the bird affected and by the rapid breathing and cough. The rattling is due to mucus in the inflamed bronchial tubes. In bad cases, birds mope, refuse to eat, and soon die.

Cause. Bronchitis may develop from an ordinary cold, or may be due to sudden changes of temperature, or to exposure to rain, cold, and damp.

Treatment. Keep affected bird away from drafts and in a warm place; dose with Epsom salts (see page 9) and give soft food, e. g., bread, bran, and middlings, with milk. Wine of ipecacuanha has been recommended for cases in which breathing is very difficult owing to excessive inflammation.

BROODER PNEUMONIA
A very serious disease, causing the death of many chickens

Symptoms. Chickens affected stand by themselves with roughened plumage. There is a whitish diarrhea, and this disease can easily be mistaken for white diarrhea. (See page 92.) Post-mortem examination will show yellowish spots on the lungs, on the walls of the air sacs, and on the liver and other organs, due to infection by the aspergillus fungus. (See page 29.)

Cause. Infection by a species of the aspergillus fungus, the spores of which are probably inhaled. This fungus is common. The spores may be in the straw used for nests or for litter, or in the food, especially if it is at all moldy.

Treatment. There is no cure for an affected chicken, and the poultryman must aim at prevention. Vigorous sanitary measures are imperative. Clean straw or excelsior should be used for nests; eggs for hatching should be disinfected by wiping with 80% alcohol; incubators and brooders should be thoroughly disinfected.

BUMBLEFOOT
Not serious if treated early

Fig. 9.—BUMBLEFOOT

Symptoms. Lameness with swelling on pad of foot.

Cause. Injury to sole of foot, developing into an abscess. Heavy birds are more subject than light ones to bumblefoot, especially if made to roost on perches that are too high.

Treatment. Paint with iodine. Lance the abscess if it is sufficiently advanced. Lower perches. Birds under treatment should have their feet bandaged, and should be put on deep straw to prevent further injury while the wounds are healing. Not serious if taken in hand promptly.

CATARRH OF THE CROP
Not a common trouble

Symptoms. Distention of crop with soft pasty matter of a more or less offensive character.

Cause. Eating stale, putrifying food or some poisonous matter.

Treatment. Empty the bird’s crop by holding the head downwards and gently pressing the contents out through the mouth. Feed sparingly on soft food.

CHICKEN POX OR SORE HEAD
An infectious disease that causes considerable loss among chickens and young birds in warm climates

Symptoms. Small, scabby, wart-like growths and eruptions on the head, especially on the comb and the wattles and around the eyes—in bad cases extending to the lids and even the mouth. Chickens and young birds are most commonly attacked by this disease, which spreads rapidly.

Fig. 10.—CHICKEN POX

Cause. The specific organism has not been definitely determined. Chicken pox may be started by the introduction of an infected bird, and mosquitoes and other insects are suspected of being agents in its spread.

Treatment. Prompt treatment may be very successful. Isolate affected birds. Apply tincture of iodine, first scraping off the scabs. Creolin 2%, or other disinfectants, may be used instead of iodine. Dirty coops are a contributing cause, and cleanliness of chicken runs and houses is important. Disinfect soil (see page 13) and woodwork (see page 12) regularly and with extra care when the first cases are noticed. When roupy lesions develop, as is sometimes the case, treat as for roup. (See page 83.)

CHOLERA
A serious and epidemic form of diarrhea for which no remedy is known

Symptoms. Fowls die suddenly with apparently little reason. There are symptoms of diarrhea and examination shows that the feces are a bright yellow or green instead of the normal color. Before death, fowls have fever and may be seen moping and showing evidences of distress. For post-mortem symptoms see page 112.

Cause. A contagious disease, due to bacteria, that, owing to infection of soil and drinking water by birds suffering from the disease, spreads rapidly through a flock. It is often introduced by the purchase of an infected bird that appears at the time of purchase to be well.

Treatment. Prevention by strict sanitary measures is what must be aimed at. It is believed that no cure is known for genuine cases of cholera. Isolate all new birds brought into the flock, especially when cases of cholera are reported in the neighborhood. The bodies of birds that have died of this disease are best burnt without delay. The germ of cholera appears to be both persistent and easily spread, and too much stress cannot be laid on the necessity of preventing its introduction, failing that, of quickly stamping it out. The sacrifice of a few birds to prevent the spread of the disease will be well repaid, for it has been necessary on occasions to kill a whole flock. In some cases it has been found best to move unaffected birds to new quarters.

Fowl typhoid, or leukemia, is a disease of the blood that may be mistaken for cholera. The poultryman must treat it in the same way.

CLOACITIS OR VENT-GLEET
Not a common disease

Symptoms. Frequent small discharges of excrement and unsuccessful efforts to discharge when the cloaca (Fig. 32) is empty, the mucous membrane of which becomes hot and inflamed. These symptoms are soon followed by an offensive discharge.

Cause. A specific disease transmitted from hen to hen by the agency of the cock.

Treatment. Immediately isolate affected hens; syringe out cloaca twice daily with 2% creolin; give mild purgative and put on soft food. Males likely to be affected should be examined, and diseased birds killed.

Caution. The hands should be carefully cleansed and disinfected, as a serious inflammation will result if the eyes are rubbed with infected hands. This is a troublesome and risky disease to treat.

COCCIDIOSIS OF ADULT FOWLS
The germ of this disease does not usually affect adult fowls seriously, but causes severe losses among chickens and turkeys

Symptoms. The external symptoms are not very pronounced; there is loss of weight and in some cases diarrhea. The disease may last for a long time and birds may even recover. A post-mortem examination shows the walls of the cæca thickened and filled with a pasty mass, while characteristic whitish or yellowish spots (see Fig. 24, d) are found in the liver.

Cause. This disease is due to the same germ (a coccidium) that causes blackhead in turkeys. Adult fowls occasionally develop this disease, but appear to be able, as a rule, to act as a host for the germs without being themselves affected, although heavy losses occur among turkeys or chickens that get the germ from them.

Treatment. Copperas in the drinking water (three grains to a quart) has been recommended, together with the occasional use of calomel in one-grain doses, or one or two teaspoonfuls of castor oil. Thorough disinfection (see page 10) of houses and runs, etc., where affected fowls have been, is important. Burn the bodies of birds that die of the disease.

COLD (SIMPLE CATARRH)
Dangerous, because it may be confused with the early stages of roup

Symptoms. Discharge from the nostrils and the eyes, with occasional fits of sneezing; loss of appetite, and moping.

Cause. Cold and damp. Colds most frequently occur in wet weather and among poorly housed and poorly fed stock.

Treatment. Warm housing and protection from cold and wet. Give quinine—one grain to an adult fowl. Many believe in dosing fowls suffering from colds with red pepper given in the food. When there are signs of stuffiness, the eyes and the nostrils should be washed out once or twice daily. Carbolic acid 2%, or boric acid, about 3%, dissolved in water, is recommended for this purpose. Witch hazel has been found very effective.

Caution. There is a risk of mistaking the early stages of roup for a simple cold. Further, birds are more likely to contract roup when suffering from a cold, and should, on this account, be isolated and regularly examined.

Influenza. The term influenza, or grippe, is generally applied to a severe cold that has no symptoms of roup.

CONSTIPATION
Not common and seldom serious

Symptoms. The bird suffering is dull and listless. Its efforts to evacuate are painful and unsuccessful.

Cause. Internal blocking of the cloaca or the intestines, or, occasionally, of the vent by dirt accumulated on the outside. Want of exercise and lack of green food are held to be contributing causes.

Treatment. If constipation is due to dirt on the outside, cleanse vent by swabbing with warm water. When stoppage is inside and can be felt through the vent syringe with sweet oil. In other cases, give a purgative such as castor oil or Epsom salts. If worms are suspected as the cause, give santonin (see page 9), followed by a teaspoonful of castor oil.

CRAMP
Must not be confused with more serious complaints

Symptoms. Difficulty in standing and lameness, due to inflammation of muscles and joints.

Cause. Damp and cold.

Treatment. Put legs of bird in warm water; rub joints with embrocation and put in dry quarters.

Note—In cases of rheumatism, tick fever, and tuberculosis, birds may show the same difficulty in standing that they do in cramp.

CROP-BOUND (IMPACTION OF CROP)
Not serious, as a rule

Symptoms. The crop is hard and swollen.

Cause. The blocking of the passage from the crop to the gizzard by a bit of stick or a stone, with the result that the food cannot pass out of the crop.

Treatment. Pour sweet oil down fowl’s throat; work the crop with the fingers, endeavoring to remove the obstructing object. If unsuccessful, cut open the crop and remove the contents, making sure that the opening into the gizzard is clear. Sew up the cut made, stitching separately first the inner skin and then the outer.

DIARRHEA OR ENTERITIS
May take a serious and epidemic form

Diarrhea is a common complaint among fowls, and in some cases takes a severe and epidemic form. The latter form may be due to various causes, and it will be best, perhaps, to deal with diarrhea under the following heads:

- 1. Mild diarrhea.

- 2. Epidemic and severe diarrhea.

- 3. Dysentery. (See page 52.)

- 4. Cholera. (See page 39.)

- 5. White diarrhea of chickens. (See page 92.)

Mild Diarrhea.

Symptoms. Looseness of bowels and staining of feathers around the anus with excreta.

Cause. Indigestion caused by food which may be too laxative; e. g., excess of bran, or, by food which may be partly decomposed or may contain an intestinal irritant. Cold may also be a cause.

Treatment. Give Epsom salts, or castor oil. (See page 9.) Change diet if food is suspected. Often no treatment is necessary, but it is not wise to neglect cases that are apparently mild diarrhea, for fear they may turn out to be an epidemic and contagious form.

Diarrhea, Severe and Epidemic

Symptoms. Excessive looseness of bowels, ruffling of feathers, depression, loss of appetite. A number of birds in the flock are attacked and death results.

Cause. There are a variety of causes. Scientific investigation has led to the discovery of specific organisms responsible for various forms of diarrhea. It would be well for poultry rearers to study the results of such work, but, for the purposes of this book, it will be sufficient to state that the causal organism may be bacterial, mycotic, or protozoan. The owner of poultry will not usually be able himself to determine what type of diarrhea the fowls are suffering from, but as a rule the treatment will have to be the same. Advice will have to be sought from an expert when dangerous epidemics are feared.

Treatment. The most energetic measures of disinfection must be undertaken. (See page 10.)

- 1. Isolate sick fowls.

- 2. Disinfect soil of run thoroughly.

- 3. Clean and disinfect coops.

- 4. In bad cases, remove the rest of the flock from the infested run.

- 5. Give sick fowls Epsom salts, or castor oil; feed fowls on soft food.

- 6. If the diarrhea is not checked, give 6 to 12 drops of chlorodyne.

DIPHTHERIA OR DIPHTHERITIC ROUP
A dangerous disease, and infected birds should be killed at once

Symptoms. A cold, accompanied by whitish and yellowish patches on the back of the throat and in the mouth. These patches apparently form a false membrane and cannot be torn off without causing bleeding. The disease is sometimes known as canker.

Fig. 11.—DIPHTHERITIC ROUP
b, lower beak; t, tongue; m, false membrane.
(After Harrison and Streit.)

Cause. This disease is often clearly a later stage of roup. It is difficult to say where one ends and the other begins. It has been claimed that the organism is the same as that which causes diphtheria in human beings, but the weight of evidence is against this conclusion.

Treatment. Diphtheria is extremely infectious. It is best to kill the first cases at once. If the bird is of particular value, it may be isolated and the patches on the throat swabbed with 50% hydrogen peroxide or 5% creolin, with a small bit of cotton wool wound around a stick. If great care is exercised, 20% carbolic acid or 20% creolin may be painted on the patches, but neither should be allowed to touch the normal skin. Burn the swabs. Treat accompanying roupy symptoms as recommended under roup.

The term canker is also applied to certain spots or growths that occur on the throat. These are not in any way associated with diphtheritic roup, or any dangerous, contagious disease, and are due to injury or to an unhealthy condition of the mucous membrane.

DROPSY
Not a common disease

Symptoms. Distention of abdomen.

Cause. Collection of liquid in abdominal cavity.

Treatment. Treatment is seldom successful. It is best and most merciful to kill the afflicted bird. If it is desired to make an effort to save the bird, carefully puncture the lower portion of the abdomen with a trocar and squeeze out the liquid. Give invalid diet.

DYSENTERY
Serious if in epidemic form

Symptoms. Severe diarrhea with blood in the discharges.

Cause. Bacterial or other specific infection of the intestines. Occasionally the eating of some poisonous or irritating substance will give rise to blood in the excrement.

Treatment. Isolate bird, and give six to eight drops of chlorodyne on a small piece of bread. Thorough disinfection (see page 10) of water, soil and house is necessary to prevent this disease spreading.

EGG-BOUND
An uncommon complaint

Symptoms. The hen goes on and off the nest straining to lay. Generally the egg may be felt through the vent. After straining for some time, she may succeed in laying the egg, and treatment should not be undertaken until it is evident that the fowl needs assistance.

Cause. Very young hens are more liable to this complaint, which arises from eggs of an abnormal size, from lack of muscular power, or from some other disorder of the oviduct.

Treatment. It will be most merciful to kill fowls in much distress, as treatment is tedious and painful to the fowl. It has been recommended to hold the fowl’s vent over steam from boiling water and then to pass an oiled finger up the vent. In bad cases, pierce the egg and withdraw the contents, then break the shell and remove all the pieces. Great care must be taken to leave no particle of the broken shell behind.

EGG-EATING
A bad habit that may be controlled

Symptoms. If remains of eggs are seen in nests or runs, the poultryman should become suspicious and make observations to prove whether any of his flock are eating eggs.

Cause. Broken eggs or soft-shelled eggs left about the yard may be the cause of hens acquiring this bad habit.

Treatment. All signs of broken eggs should always be immediately removed. The culprit, when detected, should be removed to a different pen and nest. Dark nests have been recommended. A trap nest will prevent a hen from getting at her egg.

EMPHYSEMA (AIR UNDER SKIN)
Not a common disease of chickens

Symptoms. In this disease of chickens the skin becomes puffed out in one or more places, generally on the neck. In rare cases the puffing spreads over nearly the whole of the body.

Cause. This disease is evidently caused by some obstruction of the air passages that forces the air to escape under the skin.

Treatment. Let out the air by puncturing the skin. Give soft and nourishing food. It will probably be wiser not to use birds that recover from this complaint for breeding stock.

EPILEPSY
An unusual complaint

Symptoms. The bird staggers about and has a fit. It may recover.

Cause. It is difficult to discover a cause; intestinal worms are suspected in some cases.

Treatment. If it is suspected that intestinal worms are responsible, try the treatment recommended for worms. (See page 95.)

FATTY DEGENERATION
Not contagious, but pointing to error in diet

Symptoms. More or less sudden deaths of birds in good condition. Post-mortem examination shows an enlarged liver and masses of fat attached to the intestines.

Cause. Something wrong with the diet; too much heat-giving food and want of exercise.

Treatment. Post-mortem proof of fatty degeneration in the flock should lead the poultry owner to change the diet, reducing the amount of heat-giving food, and giving more exercise. Some authors draw attention to a fatty degeneration in which the liver is shrunken and shows fat globules under the microscope.

FAVUS (WHITE COMB)
Disfiguring, but easily controlled if treated early

Symptoms. Whitish scabs or crusts on the comb, the head and down the neck.

Cause. Due to a fungus that spreads, if not treated, and that probably starts where there is an abrasion of the skin.

Treatment. Treat in early stages of the disease by dressing with sulphur ointment. (See page 9.) Isolate bird. If the case has been neglected and allowed to develop, the crusts must first be moistened with oil and the surface scraped off with a blunt instrument. Then apply tincture of iodine or nitrate of silver.

FEATHER-EATING
Not a very common habit

Symptoms. The presence of bare patches and injured plumage on birds should lead the poultryman to watch for feather-eaters.

Cause. Irritation from insects, some defect in diet, or natural cussedness.

Treatment. Isolate the offender, and, if persistent and of no special value, kill, for fear the bad example may be followed by others. If several fowls develop this vice, try hanging up a bone for them to peck at and thus distract their attention.

FLEAS
An occasional parasite of poultry

Symptoms. Fleas are found on the fowls or in the straw of their nests.

Description. The flea that attacks fowls is known as the hen flea (Pulex gallinæ). It is dark colored and has sharp mouth parts. Doubtless it causes the fowl it attacks much irritation in addition to loss of blood.

Treatment. Keep poultry houses in a clean, sanitary condition. Dust the infested fowls with an insect powder or dip them in creolin, about 1%. Burn infested straw.

FRACTURES

Broken bones of legs or wings can be mended by placing the bones back in their proper positions and binding with light splints. The splints may be removed in about four weeks. It will be found that shanks are easily set, but that broken wings give far more trouble.

If a fowl dislocates its leg or its wing, the joint should be gently pushed back into place.

FROST BITE
A strain on the bird’s system

Symptoms. Combs and wattles are most liable to frost bite, particularly in breeds in which these parts are large.

Cause. Exposure to very low temperatures, especially if birds are suddenly turned out from warm quarters; dipping comb and wattles in water when the temperature is low.

Treatment. Prevent by keeping birds as warm as possible during winter, and do not allow them to go out early in the mornings in very cold weather. Drinking water should be provided in a vessel from which birds can drink without wetting their wattles. In a case of frost bite, thaw the affected parts by gently rubbing with vaseline and afterwards treat with a mixture of two grains of salicylic acid to one ounce of vaseline or lard.

GAPES
Serious in badly infested yards

Fig. 12.—GAPES
On left: Chicken affected with gapes. On right: a, male and female gape worms; b, gape worms in windpipe. (From Salmon.)

Symptoms. Frequent gaping and coughing; young chicks attacked, as a rule. Notice if any worms are coughed up by the chicken; if none can be found, but the gaping continues, put a stripped feather down the windpipe, as recommended under treatment, and see if any gape worms can be pulled up.

Cause. Small worms, red in color when engorged, which attach themselves to the mucous membrane of the windpipe. Affected birds cough up worms or ova, which infect the yard and sometimes the water supply. Earthworms taken from infested yards have been found to contain portions of gape worms, and may be one means of infecting poultry.

Treatment. Isolate attacked poultry and disinfect coops and yards. The worms may be extracted from the windpipe of a gaping chicken with a feather stripped nearly to the end, and moistened, but not dripping, with oil of turpentine. Hold the mouth open, push the feather down the windpipe, and give it a sudden twist, which will dislodge the worms and allow of their being drawn up. Fumigation by holding the bird’s head over an irritant vapor, such as that of carbolic acid poured into boiling water, is risky, but sometimes successful. If not cautiously done, much suffering may be inflicted on the bird.

Post-mortem. Cut open the windpipe and look for the worms, which may be easily recognized by Fig. 12. Male and female specimens will be found attached to one another.

GASTRITIS (CATARRH OF THE STOMACH)
Not a common complaint

Symptoms. This disease cannot be readily diagnosed while the fowl is living; it is generally associated with catarrh of the crop. (See page 37.) The symptoms are similar. Post-mortem examination will show the lining of the stomach in an inflamed condition.

Cause. The inflammation of the lining of the stomach is generally due to eating decomposing food or other poisonous matter.

Treatment. Empty the crop as recommended under Catarrh of the crop. Give one or two tablespoonfuls of castor oil and feed on soft and easily digested food with milk or barley water. Be sure that poultry are not allowed to run under trees that have been sprayed with arsenical poisons.

GOUT
Not a common ailment

Symptoms. The bird sometimes loses weight, and as the disease develops shows stiffness and an indisposition to stand. In some cases small nodules containing crystals of urate of soda occur on the underside of the toes.

Cause. Failure of the kidneys to perform their normal functions and consequent accumulation of urates in the bird’s system in excessive quantities. Gout may be due to too concentrated feeding.

Treatment. Medicines and treatment are of little avail. Endeavor to prevent by feeding a mixed diet.

Post-mortem. In one form of this disease, known as visceral gout, the liver and other abdominal organs are covered over with a powder-like deposit of the crystals of urate of soda.

HEART DISEASES
Not common, and cannot be treated

The heart is an organ that is subject to several serious diseases, but these cannot be detected with any certainty while the bird is living, and treatment cannot be recommended as likely to be successful. Post-mortem examination may show the following symptoms:

1. The heart sac full of serous liquid, in the case of pericarditis, or dropsy of the heart sac.

2. A reddening of the membrane lining the heart, in the case of inflammation (endocarditis).

3. An enlarged heart, in the case of enlargement of the heart.

4. Hemorrhage, in the case of rupture of the heart and of the blood vessels.

INDIGESTION
Disorder of the intestinal tract, that is not very serious

Symptoms. The bird mopes and shows signs of a capricious appetite. Either diarrhea or, less commonly, constipation, may be a symptom.

Cause. Disorders of the digestive tract, due to error in dieting—for example, overfeeding, or too little green food and not enough exercise.

Treatment. Alter the feeding, see that the water is clean, and give a dose of Epsom salts. (See page 9.)

JAUNDICE
Not a common disease

Symptoms. A yellow comb may indicate jaundice, but there are no definite external symptoms. Post-mortem examination shows distention of the gall bladder, due to an excessive secretion of bile.

Cause. Said to be due to continued congestion of the liver, arising possibly from too much heat-giving food.

Treatment. If the disease is suspected, give one grain of calomel as a purgative and feed on more green food.

KIDNEY DISEASES
With the exception of gout, kidney diseases cannot be detected by external symptoms

Gout (see page 63) is the commonest disease of the kidneys. In addition, there are some disorders of the kidneys (e. g., enlargement) that may be noticed on post-mortem examination. Little is known about these diseases; there are no symptoms that can be recognized before death, and no treatment can be recommended.

LEG WEAKNESS
Constitutional weakness, to which the heavier breeds are more subject than are the lighter ones

Symptoms. Fowls walk in an unsteady manner, without showing any specific cause for lameness. Young birds are more likely to be affected in this manner, particularly those of the heavier breeds.

Cause. Too rapid growth, the bird outgrowing the strength of its legs.

Treatment. Reduce the quantity of fat-producing foods. Care in the selection of breeding stock is important.

LICE
Invariably present in small numbers, and likely to become a serious pest, if not persistently controlled

Symptoms. Unthrifty look of fowl and signs of irritation; desertion of nest by setting hens; and, of course, the detection of lice on the fowl: this may be done by quickly turning over the feathers on the body and looking for the lice.

Fig. 13.—LOOKING FOR LICE

Fig. 14.—Three Lice That Commonly Affect Fowls (From Salmon.)
a. Lipeurus variabilis.
b, Menopon pallidum.
c, Goniodes dissimilis.

Cause. Introduction of an infested fowl; neglect to dust fowls regularly to keep down lice, and to clean out fowl houses and change the straw of nest boxes. At the season that lice are likely to be most prevalent the poultryman should take precautionary measures.

Description of lice. Lice are small insects ranging in size from 1∕25 to 1∕8 of an inch. They breed rapidly, laying their eggs on the feathers. They are not blood-sucking insects, but cause much irritation to the birds they infest.

Several species are found on fowls. Fig. 14 shows three of the common species.

Treatment. Dust fowls with fresh insect powder (pyrethrum). Smear sulphur ointment on head and under wings, especially in the case of chickens. Infested fowls may be dipped in 2% creolin. Dust setting hens with a lice powder before putting them on their nests. Infested straw should be burnt, and boxes, nests, fixtures, etc., should be thoroughly sprayed with 2% creolin.

LIMBER-NECK
An occasional complaint

Symptoms. The muscles of the fowl’s neck become so relaxed that they cannot support the head.

Cause. Limber-neck, due to partial or entire paralysis of the muscles of the neck, is believed to be associated with acute indigestion or worms.

Treatment. A strong purgative may be the means of effecting a cure by cleaning out any intestinal poisons and thus correcting the cause. If the treatment recommended does not effect a cure in a few days, kill the bird.

LIVER DISEASES

The liver is affected by several diseases, and the poultryman, who finds a spotted liver on post-mortem examination, will be much aided in determining the cause, if he takes into consideration the symptoms noticed before the fowl died, as well as the changes in the other internal organs. The importance of the post-mortem examination is in distinguishing whether the death of the fowl is due to a contagious disease.

The causes of diseased livers may be conveniently divided into two classes:

1. Diseased livers due to indigestion, e. g., enlargement.

2. Diseased livers due to a specific disease, e. g., tuberculosis.

Diseases Due to Indigestion

In this class may be included degeneration, inflammation, congestion, enlargement, and atrophy of the liver. There are more or less distinct differences in these diseases, but the only possible methods of treatment known at present are very much the same.

Symptoms. There are no definite external symptoms. The poultryman’s suspicions should, however, be aroused if fowls apparently in good health die suddenly. A post-mortem examination will reveal a liver of abnormal size, or somewhat shrunken, and of unhealthy texture.

Cause. The cause is generally something wrong in the feeding. Fowls may be eating too large a proportion of heat-producing foods and not enough green food. If an enlarged liver is associated with an excessive layer of fat covering the internal organs, it points to too large quantities of carbohydrates.

Treatment. Correct errors in feeding. Give more green food and let the fowls scratch for some of their grain. If errors in feeding and general management are not obvious, make experimental changes.

Diseased Livers Due to Specific Diseases

Tuberculosis, coccidiosis, gout and other specific diseases are responsible for spotted or diseased livers. (Fig. 24.) The section on diagnosis by post-mortem examination gives further information on these subjects and shows how the principal diseases may be distinguished.

The term cancer is sometimes applied to cases in which there are tumors on the liver.

MAGGOTS
Occasionally found in flesh wounds of poultry

Symptoms. A flesh wound that instead of healing develops into a sore with a slight running. On examination, maggots will be found.

Cause. Several species of flies are always ready to lay their eggs in any available wound or sore; therefore wounds must be watched in the case of poultry, as with all other animals of the farmyard. The eggs laid by these flies hatch and develop into small footless grubs commonly known as maggots.

Treatment. Wash the wound with 1 to 2% creolin; remove as many of the maggots as possible with a pair of tweezers or a feather. If the maggots are deep-seated, stuff the wound with a cotton wad saturated with strong creolin or 10% carbolic acid. Examine next day and remove dead maggots. Treat again in a similar manner if the maggots are not all killed. Fish oil, or iodoform made into a paste with vaseline, will prevent the flies depositing their eggs, if smeared on the surface of the wound.

MITES (AIR-SAC)
Not a common parasite

Symptoms. There are no definite external symptoms. If the bird is very badly affected, there may be evidences of suffocation. This may end fatally. A post-mortem examination will show the mites in the air passages and bronchi as small yellowish and whitish particles, which on careful observation may be seen to move.

Fig. 15
The Air Sac Mite(From Salmon.)

Cause. A small mite (Sarcoptes lævis) which infests the air sacs and bronchi. These mites, when present in large numbers, obstruct the air passages and cause suffocation. A secretion from the mucous membrane affected, results from the presence of the mites and increases the obstruction of the air passages.

Treatment. The fumigation method tried for gapes has been recommended, but there is little reason to expect success.

MITES, DEPLUMING (SCABIES)

Fig. 16. The Depluming Mite(From Salmon.)

Symptoms. Bare patches on the bird’s body due to the loss of feathers. The rump and the breast are most frequently attacked.

Cause. A small mite (Sarcoptes lævis) found on the bird’s body near the base of the fallen feathers.

Treatment. Isolate affected birds; rub bare patches and neighboring portion of body with sulphur ointment (see page 9) or dip body of fowl in a solution of about 2% creolin.

MITES (RED MITE)
A serious pest

Symptoms. Unthriftiness of birds.

Cause. A small whitish mite, which appears red when filled with blood. These mites suck the bird’s blood at night and hide during the day in the sockets of the perches and in the crevices of the woodwork.

Fig. 17.
The Red Mite

Treatment. Examine the fowl house at night. Dust hens with an insect powder; thoroughly spray houses and perches with 5% creolin or other disinfectant, and squirt kerosene oil or turpentine into cracks and crevices. A specially constructed mite-proof perch, or one that can be easily removed, should be used.

MOLTING

Molting is not a disease, but may prove trying to poultry not in the best condition to stand the strain of the process. Hens overtaxed with forced laying and cocks running with too large a number of hens are most likely to suffer. Molting occurs in healthy adult birds every twelve months. The process, which is a natural one, should be allowed to take its natural course unless the fowls appear weak and depressed during the period. In such cases specially nourishing and stimulating food should be given. Anyhow, it would be well to pay particular attention to the feeding of birds during the molting season.

OVARY DISEASES

Hens suffer from various diseases of the ovary, which may become shriveled and useless or gangrenous. Tumorous growths, sometimes called cancers, are also found. As diseased conditions of this organ can be detected only by post-mortem examination, and as no remedies are known, the subject need not be dealt with more fully.

OVIDUCT, DISEASES OF

Abnormal eggs must be regarded as due to functional disorders of the oviduct. One cause of soft eggs is lack of shell-forming material; therefore a liberal supply of powdered oyster shells, or lime in some other form, should always be accessible to laying hens. Other abnormal eggs occur, such as those with double yolks, without any yolk, with blood clots, etc. No treatment can be suggested beyond feeding a varied diet and avoiding too stimulating or over-heating foods.

Prolapse of the oviduct may occur. The protruding portion should be oiled or vaselined and gently pressed back.

PERITONITIS
Not common and not contagious

Symptoms. Loss of appetite, fever and evidence of discomfort and pain in the stomach, especially if the abdomen is pressed with the hand. Post-mortem examination shows inflamed appearance of membrane of the abdominal cavity.

Fig. 18.—Organs of Reproduction of the Hen (From Salmon.)

a. Undeveloped ovules in ovary.

b. Partly developed ovule showing stigma. Here the follicle wall breaks and allows the ovule yolk to leave the ovary preparatory to laying.

c. An empty follicle in which the stigma and the yolk passed out.

d. Opening of oviduct.

e. Portion of oviduct distended, allowing yolk to pass down.

f. Walls of oviduct which secrete albumen forming the white of the egg.

g. Membranous lining added.

h. Portion of oviduct that secretes shell-forming substance.

i. Cloaca.

Cause. Serious inflammation of the wall of the abdominal cavity.

Treatment. Put the bird in a quiet place. Aconite (see page 9), to reduce the temperature, and opium, or one drop of laudanum, to relieve pain, have been recommended, but as a rule it is best to kill the bird.

PIP
Generally the effect of some other disorder

Symptoms. A hardened scale formed at tip of tongue.

Cause. Generally due to cold or other disorder affecting the breathing of the bird.

Treatment. Do not try to tear off the growth on the tongue by force, but moisten with vaseline or glycerin until it becomes loose. Give soft food.

PNEUMONIA AND CONGESTION OF LUNGS
Generally fatal

Symptoms. Extreme depression and great difficulty in breathing. Difficult to distinguish in the living bird from a very bad cold. Post-mortem examination shows the affected lung filled with an exudate. The lung sinks if put in water.

Cause. Following on a cold, the lung becomes congested with blood and a dark, viscous matter. Pneumonia may be considered a further, and generally final, stage of congestion.

Treatment. A cure is seldom effected, but in the case of a valuable bird the following treatment may be tried Keep the bird in a dry, warm place; paint the skin above the lungs with tincture of iodine; give aconite. Feed on soft food and give a stimulant.

POISONING

Symptoms. As a rule the poisons that fowls eat are mineral. The most pronounced symptom is evidence of pain. In cases of arsenical poison there is diarrhea. A poison containing a copper compound acts partly as an emetic, causing the fowl to make an effort to vomit. In cases of mineral poisons, post-mortem examinations show inflammation of the stomach and the digestive tract.

Sources of poison. Poultry are likely to get poisoned from the following sources:

Fertilizers (e. g., nitrate of soda) used on fields in which fowls scratch for food. Such cases are rare.

Insecticides and fungicides (e. g., Paris green [arsenic], lead arsenate, Bordeaux mixture) applied to plants under which fowls run. If sprays are mixed in correct proportions and used in normal quantities, there is little danger to poultry feeding on the grass below sprayed trees. Great care should, however, be taken in disposing of the sediment and the residue after spraying operations are completed.

Rat poisons (e. g., phosphorus, strychnine, baryta). These poisons are particularly dangerous when mixed with cornmeal or other bait attractive to fowls. The best way to set rat poison is to put it in a piece of piping of such a diameter and length that fowls cannot reach it.

Salt. Food mixed with salt for other domestic animals may be accidentally given to fowls. Chickens are the most likely to be poisoned by excess of salt.

Treatment. If fowls have eaten poisonous substances, the fact is not usually discovered until after death or until it is too late to administer an antidote. Most of the poisons fowls are likely to eat act as irritants of the digestive tract. Milk and white of egg should be given. It is advisable to give a stimulant, such as half a teaspoonful of brandy.

PYÆMIA
Not contagious, and not common

Symptoms. This disease cannot be diagnosed except by post-mortem examination and microscopic identification of pus-forming organisms in the infected areas (whitish spots) of liver, spleen, etc.

Cause. Pus-forming organisms believed to enter the blood through a wound in the skin.

Treatment. As there are no external symptoms, treatment is not possible.

RHEUMATISM
Not a common trouble

Symptoms. Lameness and stiffness of joints.

Cause. May be due in some cases to too stimulating food and to dampness.

Treatment. Put affected bird in dry quarters and vary food, adding more greens. Rub joints with embrocation, or turpentine and oil.

ROUP (CONTAGIOUS CATARRH)
One of the most serious contagious diseases

Symptoms. The bird first has symptoms of an ordinary cold, such as running at the nostrils and sneezing. Definite evidence of roup is the offensive odor detected on opening the bird’s mouth. The exudate is also offensive. The disease may attack the eyes, which then become inflamed and swollen; a tumor, containing offensive, yellowish, cheesy matter, sometimes develops. The course of the disease may extend over several weeks or months and there may be cases of chronic roup. Some cases end fatally in a comparatively short time. The form of the disease, in which yellowish patches develop on the throat, is dealt with under diphtheria or diphtheritic roup.

Fig. 19.—EXAMINING A FOWL WITH A SUSPICIOUS COLD

Cause. Cases of roup occur when birds are subjected to draft and damp, but the cause must be infection with disease germs. It is believed that the almost constant presence of the germs is due to lack of regular disinfection and to birds in the flock believed to have recovered from a previous attack of the disease, but that, in reality, are suffering from chronic roup, and are able, whenever suitable conditions arise for an outbreak of this disease, to infect the rest of the flock through the drinking water and the soil.

Treatment. The seriousness of this disease makes it imperative for the poultry rearer to isolate immediately any birds showing any suspicious symptoms. If treatment of the infected bird is taken in hand early, and carried out faithfully, a cure can be effected, but it is often wiser to kill and burn infected stock. In treating birds, the mouth and nostrils should be washed out with 5% carbolic acid, or with 50% hydrogen peroxide, or with 2% permanganate of potash. It is important to clean out the passage of the nostrils, and this may be done by:

1. Pressing against the roof of the bird’s mouth from inside and squeezing the nostrils from above downwards.

2. Syringing out the nostrils.

3. Dipping the fowl’s head for a few seconds in a solution of the disinfectant. Great care should be exercised in this method of treatment, which is only recommended when permanganate of potash is used.

It is well to keep birds isolated for some time after apparent recovery. When the eye is affected (see Fig. 20), the tumor should be carefully lanced and the cheesy matter removed, after which the cavity should be rinsed out with one of the disinfectants recommended above; such treatment may have to be repeated time after time.

Fig. 20.—A Roupy Eye

As an after effect of a cold or of roup, conjunctivitis or sore eyes may develop. A discharge comes from the eyes and the eyelids become stuck together. Bathe the eyes with hydrogen peroxide mixed with an equal quantity of water.

If this condition follows an attack of roup, there is danger that the fowl has not entirely recovered, and may be a source of infection to the rest of the flock.

SCALY LEG
An unsightly affection that, although contagious, does not spread rapidly

Symptoms. A rough and scaly growth on the legs of the bird.

Fig. 21.—SCALY LEG
A. Showing early stages of attack.

Cause. A small mite (Fig. 22), known as Sarcoptes mutans, burrows in the skin and gives rise to the unsightly growth (Fig. 21) that gives this disease its name.

Fig. 22.-The Mite That Causes Scaly Leg

Treatment. Soften the scaly growth by washing and soaking the legs with warm water and soap. Scrub the affected portion of the legs with a brush and then treat as follows: Dip the legs in kerosene oil, holding them there for not longer than a few seconds. If the kerosene oil is mixed with sweet oil, or if the legs are wet first with water, there will be no risk of the kerosene proving harsh, as sometimes happens. Sulphur ointment (see page 9) may be used instead of the kerosene oil treatment.

SOFT CROP
Not a serious complaint

Symptoms. Distended crop, soft to the feel.

Cause. Over-eating; or food turning sour in the crop.

Treatment. Hold bird downwards and squeeze contents of crop through mouth, taking care not to suffocate the patient. Repeat treatment if necessary. Put on low diet for some time, feeding slowly and sparingly.

TICKS
A pest found in the Southern States and tropical countries

Symptoms. The fowl has fever, appears depressed, and stands in a cramped position.

Fig. 23. The Fowl Tick a. Adult.
b. Larva.

Cause. The fowl tick (Argas minatus), which hides during the day in cracks and crevices, sucks the fowl’s blood at night and introduces a fever-producing parasite.

Remedies. Examine sick birds during the day, and visit the roosts at night, for proof of the presence of ticks; carefully search under perches, in nests, and in corners of woodwork, etc. Spray woodwork with 5% creolin; squirt kerosene oil, or turpentine, into cracks and crevices.

TUBERCULOSIS
A very serious poultry disease

Fig. 24. Organs Affected by Tuberculosis and Blackhead

- a. Normal spleen.

- b. Tubercular spleen.

- c. Portion of tubercular liver.

- d. Blackhead liver of turkey for comparison with c.

- a and b after Edwards.

Symptoms. This disease may be present in a poultry yard for some time without being detected. Suspicion should be aroused if birds gradually lose weight and die. If a bird that has gradually been getting thinner, goes lame, or loses the use of a wing, without apparent injury, the evidence that tuberculosis is present is strong, but positive proof of its presence can be obtained only by post-mortem and microscopic examination. This disease generally attacks adult birds.

Cause. The specific organism causing this disease, known as the Bacillus tuberculosis (Fig. 5), infects the liver (Fig. 24), the spleen (Fig. 24), and other organs, least frequently the lungs. The disease may be introduced into a flock by the purchase of an infected bird, and may be spread by uninfected birds picking up the excrement of diseased birds with their food.

Treatment. There is no known cure. The insidious manner in which this disease advances through a poultry yard makes it a very serious malady. Birds suffering from it should be killed and burnt. Thorough disinfection of coops, etc., should be made. Strict attention to sanitation will help in preventing and controlling this disease. If many birds in a flock are believed to have tuberculosis, it would be well to destroy the whole flock and start again, preferably on fresh ground.

WHITE DIARRHEA OF CHICKENS
A very serious disease, causing the death of large numbers

Symptoms. Chickens are generally attacked when 10 to 15 days old. They appear listless, their feathers become rough, and they stand about with drooping wings. A white diarrhea is soon noticed. Chicken after chicken shows similar symptoms and dies, resulting in much loss and discouragement to the poultry rearer.

Fig. 25.—CHICKENS AFFECTED WITH WHITE DIARRHEA
Ten-day White Leghorn chickens showing symptoms of bacillary white diarrhea. (After Rettger & Stoneburn.)

Fig. 26.—HEALTHY CHICKENS
Normal ten-day White Leghorn chickens. (After Rettger & Stoneburn.)

Cause. Various causes, such as improper or stale food, may upset the chicken’s digestive organs and give rise to a whitish diarrhea, but the term “white diarrhea” is best restricted to a contagious form of diarrhea due to minute parasites in the intestinal tracts of chickens. A coccidium and a bacillus have been proved by different investigators to cause very similar forms of white diarrhea. A distinct form of white diarrhea, known as brooder pneumonia, is described on page 35.

Treatment. This disease is a very difficult one to control. Incubators and brooders should be thoroughly disinfected. Special care should be taken in the feeding during the first few weeks. Chickens should not be overfed. The feeding of dry bran is recommended, as it tends to keep the bowels in a healthy, active condition. In the form of white diarrhea due to a bacillus, suspicion rests on the hen and the egg as sources of infection. When the disease becomes serious, and general sanitation and proper care of chickens do not control it, the advisability of obtaining the eggs for hatching from a poultry farm free of white diarrhea should be considered.

WORMS
Intestinal parasites that occasionally become serious

Symptoms. General debility; worms or segments of worms; seen in the droppings. If there is doubt as to whether a flock is suffering from worms, give a suspected bird a strong purgative and keep it up so that the feces may be examined for worms. If doubt still exists, the suspected bird should be killed and a post-mortem examination made. Cut the intestines open lengthways (see Fig. 34) with a small pair of scissors and wash them out with water so as to detect the smaller worms, and the tapeworms attached to the lining of the intestines.

Fig. 27.—Worms in Intestinal Tract of Fowl
(After Bradshaw. From Pearl, Surface & Curtis.)

Cause. Two classes of worms are commonly parasitic on fowls—round worms (see Fig. 27) and tapeworms. There are generally a few specimens of worms in the intestines of fowls; but only when the numbers are large do worms affect the health of the fowl.

Fig. 28.—THE PARTS OF A FOWL

Fig. 29.—SKELETON OF A FOWL

Treatment. Every bird suspected of having worms may be tested with a purgative as suggested above. Or, if it is established that several birds in a flock are suffering from worms, all in poor condition, without any cause being apparent, should be dosed with santonin—three to five grains in the morning before any food has been picked up. After about two hours give a purgative of two teaspoonfuls of castor oil and soon after let the fowl have its morning food. As important as dosing the fowls, is disinfecting the feed troughs, the water vessels, and the soil of the runs in order to prevent re-infection.

Nodular tæniasis. Small nodules on the intestines, resembling the nodules in tuberculosis, are sometimes caused by tapeworms. The name “nodular tæniasis” has been given to this disease.

CHAPTER V
Post-mortem Examinations

1. Making the Examination

A post-mortem examination should always be undertaken if there is any doubt as to the cause of death. Poultry rearers who are not already familiar with the normal appearance of the internal organs of a fowl should take the first opportunity of studying them.

Post-mortem examinations should be done in a systematic manner; but, if desired, a very speedy examination may be made by rapidly removing, or bending back, the breast bone of the unplucked bird.

It will be more generally satisfactory, however, to devote time to the operation, and it is suggested that the work be carried out on the following lines:

1. Nail the body of the dead fowl on a board in the position shown in Fig. 30, having first partly or wholly plucked the bird.

Fig. 30.—POST-MORTEM EXAMINATION NO. 1
Fowl nailed on board; lines A B, A C and B D show where to cut.

2. With a sharp knife cut along lines AC, BD (Fig. 30), and bend the breast bone backwards, exposing the internal organs. (Fig. 31.) As the breast bone is raised it will be necessary to cut through the mesentery and other connecting tissues. Break it back at D, cutting through the flesh and the muscle with sharp scissors.

3. Remove heart, liver, gall-bladder and spleen, making neat severances and without injury to any of the other organs. If the heart or large blood vessels be injured in the operation, blood will flow out and interfere with the work.

Fig. 31.—POST-MORTEM EXAMINATION NO. 2
Breast bone removed; internal organs in situ.

4. Cut through the œsophagus, below or above the crop, as most convenient, and also cut through the large intestine near the cloaca. Without disconnecting the parts, lift out the gizzard, intestines, and other portions of the alimentary canal, carefully tearing away the membranous tissues of the mesentery.

5. Spread the organs out and examine each one carefully and critically, making sections if necessary. (Fig. 32.)

6. Cut open gullet, crop, stomach, gizzard, intestines, and cæca and examine the contents.

7. Examine the lungs, cutting off a portion and throwing it into water, when it will float if healthy, but sink if congested.

8. Cut through the skin of the neck. Sever the windpipe near the head, and also where the bronchi enter the lungs. With scissors cut it open, and examine for molds or gapes or for exudates indicative of various forms of cold or lung congestion.

Fig. 32.—POST-MORTEM EXAMINATION NO. 3
Internal organs removed for examination.

9. Examine the brain (Fig. 34) for blood clots. Some care will be necessary in cutting through the skull so as not to injure the brain tissue, which should be a milky white. A sharp and strong pair of scissors or a small, fine saw (e. g., tenon saw) will be useful for older birds. Remove the skin and cut from behind, raising the bones and exposing the brain.

2. The Normal Condition of the Internal Organs

(See Fig. 32.)

The œsophagus carries the food from the mouth and passing down the neck beside the windpipe opens into—

The crop, where the food is macerated. Thence it gradually passes into—

The true stomach (or proventriculus), which is lined with small gastric-secreting glands that may be seen with the naked eye. This organ is hidden by the liver, and opens directly into—

Fig. 33.—POST-MORTEM EXAMINATION NO. 4
Lungs, kidneys, etc., in situ.

The gizzard, situated on the left side of the abdomen. It rests on the coiled-up mass of intestines. It is dark red and is partly hidden by the left lobe of the liver. The walls are strong and muscular. Here the food is ground against small bits of stone, etc. The partially digested food passes out through an aperture near the entrance of the true stomach into—

The duodenum or upper portion of the small intestine. It forms a loop that incloses—

The pancreas, a compact, flattened organ, pinkish in color, that discharges its secretion by three ducts into the intestines.

The small intestine, after forming the loop (duodenum), continues its course. It first passes toward the left and is disposed in many folds connected by the mesentery; toward the end it passes up behind the true stomach. Connected to the intestines are the blind bodies known as—

The cæca, connected to the small intestines for several inches and which, after becoming considerably smaller in diameter, enter the alimentary tract where—

The large intestine (rectum) starts. This portion of the intestines is short and enters—

The cloaca, into which the urinary and reproductive ducts discharge. The external opening is known as the vent or anus.

The brain, situated in the back of the head, is protected by the cranial bones. It is milky white except where the blood vessels may be seen.

The windpipe connects the larynx at the throat with the lungs branching into the two bronchi.

The lungs, situated in the upper portion of the thoracic abdominal cavity, are firmly attached to the ribs, in the interspaces between which they fit. They are flattened and oval in shape, bright red in color, and loose and spongy in texture.

The heart is cone-shaped. The lower portion rests between the lobes of the liver. The heart is red and is inclosed in a sac (the pericardium) that is easily removed.

The liver, situated a little lower down than the heart, consists of two lobes. The right lobe is often larger than the left which may be cleft at the lower end. The left lobe covers the true stomach and part of the gizzard. If there is some delay in holding a post-mortem examination the edges of the lobes of the liver become discolored. Normally the color is a purplish red.

The gall bladder fits into a shallow depression on the underside of the right lobe of the liver and appears green in color. A duct conveys the bile from the liver into the gall bladder, whence it passes by another duct into the intestine.

The spleen, a nearly round, reddish body, with a purplish tinge, is attached by a ligament to the right side of the true stomach and is hidden by the liver.

The kidneys extend along the sides of the spine from immediately below the lungs to near the termination of the abdominal cavity. The general color is a chocolate red, but a small portion at the upper end (known as the adrenal), is yellow. There is no urinary bladder. The urates are carried direct through the ureters to the cloaca.

The testes (of the male bird) are attached to the upper portion of the kidneys. They are white or very light-colored, and may be of different sizes.

The ovary (of the female bird), situated on the left side, covers the kidney on that side. It consists of numerous ova of various sizes each of which may develop into an egg. As an ovum passes through the oviduct it is first coated with an albuminous covering (the white of egg); lower down it is coated with a calcareous deposit that forms the shell of the egg. (Fig. 18.)

Fig. 34.—POST-MORTEM EXAMINATION NO. 5
Examination of brain and of portions of intestines and windpipe.

3. Diagnosis of Disease by Post-Mortem Symptoms

For purposes of diagnosis each organ must be examined. Note in each case if it is enlarged, spotted, ruptured, inflamed or engorged with blood. Observe if it is an unusual color or if it possesses any other symptom of an abnormal character.

A single symptom in a single organ, unless very pronounced and characteristic, will not be sufficient evidence for forming an accurate opinion as to the cause of death. But if the condition of the other organs and the symptoms before and attending death are taken into consideration, there will seldom be any difficulty, from a practical standpoint, in deciding upon the nature of the disease. Many points can be decided only by a pathologist with the aid of a microscope, such, for example, as the difference between coccidial and bacterial diarrhea, but it is quite enough for the poultryman to realize that one of his fowls has died of an attack of an acute form of diarrhea and that the rest of his birds may become infected.

The following notes draw attention to the main diagnostic symptoms observable on post-mortem examination, arranged under the heading of the organs affected. Other symptoms are put in parentheses.

Post-Mortem Symptoms

BRAIN

Apoplexy.—Shown by congestion of blood vessels of brain. (Staggering gait and sudden death.)

HEART

Cholera.—Punctiform hemorrhages are generally found in the heart in cases of cholera. (Yellow feces; diarrhea; sudden death of several or many fowls; inflammation of upper portion of intestines.)

LIVER

Tuberculosis.—Yellowish-white spots on liver varying in size, somewhat raised and convex; the spots or nodules may be readily separated from the rest of the liver. The liver itself is often very much enlarged. (Fowl gradually loses weight and may go lame; mesentery and spleen affected with nodules.)

Cholera.—Liver enlarged, dark green and softened, sometimes showing whitish spots.

Coccidial diarrhea.—More or less circular patches, depressed in the centre, associated with plugged cæca, the linings of which have sores.

Congested liver.—Much enlarged and engorged with blood, may be readily torn.

Fatty degeneration or fatty liver.—In the first case the liver is rather shrunken and hardened, and in the latter excessive deposits of fat may be noticed.

Liver trouble.—(Indigestion.) An enlarged liver without any of the special symptoms noted among the other diseases of the liver.

Gout.—Needle-like crystals (urate of soda) give the liver the appearance of having been covered with chalk. (Other organs in abdominal cavity covered with same powder-like crystals.)

Aspergillosis.—Necrotic areas with mold. (Fowls go light and move about in a depressed manner, resting on their breast bones.)

STOMACH

Gastritis.—The mucous membrane lining of the stomach is reddened and inflamed.

INTESTINES

Diarrhea.—Acute forms of intestinal troubles give rise to inflammation of the mucous membrane lining the walls of the intestines.

Cholera.—The upper portion of the intestines may be reddened and the contents show streaks or clots of blood.

Worms.—Round or tape worms present in intestines.

CÆCA

These blind ducts are of importance in showing the presence of coccidiosis in fowls or blackhead in turkeys.

Coccidial diarrhea.—The cæca are enlarged and show ulcers developing from the inside.

WINDPIPE

The linings of this organ should be clean and free of obstruction or mucous exudations.

Gapes.—Small worms about three-quarters of an inch long are found attached to the trachea.

Aspergillosis.—A whitish mold will be seen along the inside of the windpipe.

Pneumonia.—The bronchial tubes contain a thick mucous exudate.

Congestion of lungs.—Blood escaped from congested lungs is found in the bronchi.

LUNGS

These should be a bright red and spongy in texture.

Congestion.—One or both lungs are distended with blood and dark in color.

Pneumonia.—A condition that follows on congestion, the whole lung affected losing its spongy texture, the air spaces being filled with a semi-solid substance.

Brooder pneumonia.—Spots due to an Aspergillus fungus on lungs. (Chickens attacked.)

MESENTERY

Cholera.—Congestion of blood vessels of mesentery often seen.

Tuberculosis.—The mesentery may be studded with nodules.

SPLEEN

Tuberculosis.—A greatly enlarged spleen.

Enteritis.—(Bacterial.) Spleen enlarged but paler in color.

URETERS

Cholera.—Ureters distended with yellow urates.

INDEX

| PAGE
Abscesses | 26
Abnormal eggs (see Oviduct diseases) | 77
Aconite | 9
Air under skin (see Emphysema) | 54
Air sac mite (see Mites, air sac) | 73
Anæmia | 27
Apoplexy | 28
Aspergillosis | 29
Atrophy of liver (see Liver diseases) | 70
Bacterial enteritis (see Diarrhea) | 48
Baldness (see Favus) | 56
Biliary repletion (see Jaundice) | 65
Blackhead of turkeys | 30
Brandy | 9
Breakdown | 33
Broken limbs (see Fractures) | 58
Bronchitis | 34
Brooder pneumonia | 35
Bumblefoot | 36
Calomel | 9
Cancer (see Liver diseases and Ovary diseases) | 72, 76
Canker (see Diphtheria) | 49
Carbolic acid 9
Castor oil | 9
Catarrh (see Cold) | 43
Catarrh, contagious (see Roup) | 83
Catarrh of crop | 37
Catarrh of stomach (see Gastritis) | 62
Chicken pox | 38
Chlorodyne | 9
Cholera | 39
Cloacitis | 41
Coccidiosis of adult fowls | 42
Coccidiosis of chickens (see Brooder pneumonia) | 35
Coccidiosis of turkeys (see Blackhead) | 30
Cold | 43
Congestion of the liver (see Liver diseases) | 70
Congestion of the Lungs (see Pneumonia) | 79
Conjunctivitis (see Roup) | 83
Constipation | 44
Cramp | 45
Creolin | 9
Crop-bound | 46
Crop, soft | 89
Crop, catarrh of | 37
Depluming mite | 74
Diarrhea, bacterial | 48
Diarrhea, mycotic | 48
Diarrhea, protozoan | 48
Diarrhea, mild | 47
Diarrhea, severe | 48
Diarrhea, white | 47
Diphtheria | 49
Diphtheritic roup | 49
Disinfection | 10
Dislocations (see Fractures) | 58
Doses | 9
Dropsy | 52
Drugs | 9
Ducks | 20
Dysentery | 52
Egg-bound | 53
Egg-eating | 54
Emphysema | 54
Enlargement of heart (see Heart, diseases of) | 64
Enlargement of liver (see Liver diseases) | 70
Enlargement of kidneys (see Kidney diseases) | 66
Enteritis (see Diarrhea) | 46
Entero-hepatitis (see Blackhead) | 30
Epilepsy | 55
Epsom salts | 9
Fatty degeneration | 56
Favus | 56
Feather-eating | 57
Fits (see Epilepsy) | 55
Fleas | 58
Fowl typhoid | 41
Fractures | 58
Frost bite | 59
Gangrenous ovary (see Ovary diseases) | 76
Gapes | 60
Gastritis | 62
Geese | 21
Going light (see Anæmia) | 27
Gout | 63
Grippe (see Cold) | 43
Guinea fowls | 21
Heart, diseases of | 63
Heart, dropsy of | 64
Heart, enlargement of | 64
Heart, rupture | 64
Hydrogen peroxide | 9
Hypertrophy of the liver (see Liver diseases) | 70
Impaction of crop (see Crop-bound) | 46
Indigestion | 64
Influenza (see Cold) | 43
Iodine | 9
Jaundice | 65
Kidney diseases | 65
Leg weakness | 66
Leukemia (see Cholera) | 39
Lice | 66
Limber-neck | 69
Liver diseases | 70
Lungs, congestion of (see Pneumonia) | 79
Maggots | 72
Medicines | 9
Mites, air sac | 73
Mites, depluming | 74
Mites, red | 75
Mites, scaly leg (see Scaly leg) | 88
Molting | 75
Nodular tæniasis (see Worms) | 97
Nursing fowls | 5
Ointment | 9
Ovary diseases | 76
Oviduct diseases | 77
Peritonitis | 77
Permanganate of potash | 9
Pigeons | 21
Pip | 79
Pneumonia | 79
Poisoning | 80
Post-mortem examination | 99
Prolapse of oviduct (see Oviduct diseases) | 77
Puffed skin (see Emphysema) | 54
Pyæmia | 82
Quinine | 9
Rheumatism | 83
Roup | 83
Scabies (see Mites, depluming) | 74
Scaly leg | 88
Soft crop | 89
Sore head (see Chicken pox) | 38
Sulphur ointment | 9
Ticks | 90
Tuberculosis | 90
Turkeys | 20
Turpentine | 9
Vertigo (see Apoplexy) | 28
Water | 11
White comb (see Favus) | 56
White diarrhea of chickens | 92
Worms | 94

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Table of Contents

Transcriber’s Notes
POULTRY DISEASES
PREFACE
CONTENTS
LIST OF ILLUSTRATIONS

CHAPTER I General Methods of Controlling Disease

CHAPTER II SUMMARY OF EXTERNAL SYMPTOMS AND TREATMENT

CHAPTER III Diseases of Poultry Other Than Fowls

CHAPTER IV Diseases and Pests of Fowls

ABSCESSES Not a common poultry complaint

ANÆMIA, OR GOING LIGHT A condition that should incite the poultryman to investigate the cause

APOPLEXY Not a common trouble

ASPERGILLOSIS A disease that exists more commonly than is usually suspected, and is the cause of the death of large numbers of young chickens

BLACKHEAD OF TURKEYS A very serious disease, making the successful rearing of turkeys difficult and in some cases impossible.

BREAKDOWN Not often seen in the poultry yard

BRONCHITIS (CROUP) Not very common

BROODER PNEUMONIA A very serious disease, causing the death of many chickens

BUMBLEFOOT Not serious if treated early

CATARRH OF THE CROP Not a common trouble

CHICKEN POX OR SORE HEAD An infectious disease that causes considerable loss among chickens and young birds in warm climates

CHOLERA A serious and epidemic form of diarrhea for which no remedy is known

CLOACITIS OR VENT-GLEET Not a common disease

COCCIDIOSIS OF ADULT FOWLS The germ of this disease does not usually affect adult fowls seriously, but causes severe losses among chickens and turkeys

COLD (SIMPLE CATARRH) Dangerous, because it may be confused with the early stages of roup

CONSTIPATION Not common and seldom serious

CRAMP Must not be confused with more serious complaints

CROP-BOUND (IMPACTION OF CROP) Not serious, as a rule

DIARRHEA OR ENTERITIS May take a serious and epidemic form

- Mild Diarrhea.

- Diarrhea, Severe and Epidemic

DIPHTHERIA OR DIPHTHERITIC ROUP A dangerous disease, and infected birds should be killed at once

DROPSY Not a common disease
DYSENTERY Serious if in epidemic form
EGG-BOUND An uncommon complaint
EGG-EATING A bad habit that may be controlled

EMPHYSEMA (AIR UNDER SKIN) Not a common disease of chickens

EPILEPSY An unusual complaint

FATTY DEGENERATION Not contagious, but pointing to error in diet

FAVUS (WHITE COMB) Disfiguring, but easily controlled if treated early

FEATHER-EATING Not a very common habit
FLEAS An occasional parasite of poultry
FRACTURES
FROST BITE A strain on the bird’s system
GAPES Serious in badly infested yards

GASTRITIS (CATARRH OF THE STOMACH) Not a common complaint

GOUT Not a common ailment

HEART DISEASES Not common, and cannot be treated

INDIGESTION Disorder of the intestinal tract, that is not very serious

JAUNDICE Not a common disease

KIDNEY DISEASES With the exception of gout, kidney diseases cannot be detected by external symptoms

LEG WEAKNESS Constitutional weakness, to which the heavier breeds are more subject than are the lighter ones

LICE Invariably present in small numbers, and likely to become a serious pest, if not persistently controlled

LIMBER-NECK An occasional complaint

LIVER DISEASES

MAGGOTS Occasionally found in flesh wounds of poultry

MITES (AIR-SAC) Not a common parasite
MITES, DEPLUMING (SCABIES)
MITES (RED MITE) A serious pest
MOLTING
OVARY DISEASES
OVIDUCT, DISEASES OF
PERITONITIS Not common and not contagious

PIP Generally the effect of some other disorder

PNEUMONIA AND CONGESTION OF LUNGS Generally fatal

POISONING
PYÆMIA Not contagious, and not common
RHEUMATISM Not a common trouble

ROUP (CONTAGIOUS CATARRH) One of the most serious contagious diseases

SCALY LEG An unsightly affection that, although contagious, does not spread rapidly

SOFT CROP Not a serious complaint

TICKS A pest found in the Southern States and tropical countries

TUBERCULOSIS A very serious poultry disease

WHITE DIARRHEA OF CHICKENS A very serious disease, causing the death of large numbers

WORMS Intestinal parasites that occasionally become serious

CHAPTER V Post-mortem Examinations

- 1. Making the Examination

- 2. The Normal Condition of the Internal Organs

- 3. Diagnosis of Disease by Post-Mortem Symptoms

- BRAIN
- HEART
- LIVER
- STOMACH
- INTESTINES
- CÆCA
- WINDPIPE
- LUNGS
- MESENTERY
- SPLEEN
- URETERS

INDEX

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