Download e-book for iPad: A Colour Atlas of Poultry Diseases: An Aid for Farmers and by J.L. Vegad

By J.L. Vegad

ISBN-10: 8181891309

ISBN-13: 9788181891303

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Additional resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals

Example text

E. coli persist for long periods outside the bird 's body in dry, dusty conditions. 3. Overcrowding 4. Poor ventilation 5. Poor litter condition 6. Exposure to ammonia 7. Temperature extremes (too hot or too cold) 8. 9. Stress Feed/water restriction 10. Immunosuppression : Certain factors cause immunosuppression. That is, they suppress the natural immune responses. The bird is therefore unable to fight E. coli and succumbs to infection. For example, viral infections and toxins, such as mycotoxins, cause immunosuppression and predispose the birds to coli bacillosis.

Egg Peritonitis Egg peritonitis is inflammation of the peritoneum caused by the presence of a broken egg in the abdominal cavity. Postmortem findings include the presence of scattered pieces of yolk, thickened yolk, cheese-like material, or milky fluid in the abdominal cavity (Fig. 62). Almost always a profuse growth of E. coli can be isolated from the caseous inspissated material in such cases. There is also inflammation of the ovaries and oviduct. A complete, or partially formed egg, may be found impacted in the oviduct.

Mortality in untreated flocks can reach 10% or more, and is most common in broilers. The disease is often established after an outbreak of coccidiosis. imeria ten ella (see 'caecal coccidiosis'). Cause Necrotic enteritis is caused by the growth of a bacterium called Clostridium perfringens (type A and C) in the caeca and large intestine. Afterwards, this organism migrates to the small intestine where it produces toxins. These toxins cause death of cells lining the intestine and are responsible for the characteristic changes of necrotic enteritis.

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A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad


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