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Additional resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
42 BACTERIAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 61. f.. coli infection (Colisepticaemia) in a chicken. Liver is enlarged, congested, and contains areas of dead tissue. Note its characteristic corn meal appearance. The liver appears as if sprinkled by ground maize. This appearance is rare and is seen only in certain severe cases. Fig. 62. Egg peritonitis in a hen. Note the presence of whitish-pale yolk in the abdominal cavity. Almost always egg peritonitis is caused by E. coli infection.
Eggs may be smaller, deformed (Fig. 42), shell-less (Fig. 43), or have calcium containing deposits on the surface. Inside, the albumen loses its viscosity. That is, the albumen is thin and watery, without clear-cut demarcation between the thick and thin albumen of the normal fresh egg. 3. In the kidney form, there is marked depression usually with respiratory symptoms, and mortality as high as 30% in the severe form . Postmortem Findings In the mild respiratory form, there is excess mucus in the respiratory tract.
The incidence is highest at about sexual maturity. Lymphoid leukosis is usually a problem of laying hens. Lymphoid leukosis and Marek's disease closely resemble each other in their involvement of liver and other organs. Whereas, today, Marek's disease is a burning problem of the poultry industry, lymphoid leukosis has been largely controlled through breeding and is now uncommon. Cause Alpharetroviruses, cause of lymphoid leukosis, are widely prevalent in commercial chickens. Infection occurs in all chicken flocks.
A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad