Western
Meeting of Poultry
Clinicians and Pathologists
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Clinicians and Pathologists
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Avian Leukosis (Myelocytomatosis) In Meat Breeder Chickens W.F. DeWitt
Involving 108,000 females 10,000 males 17 lay barns Primarily Ross males Petersen males Shaver females Ross females Signs Emaciated males Elevated mortality 20-40 weeks of age
Post Mortem Atrophy of musculature No fat Liver enlarged – focal pale areas in the parenchyma Spleen enlarged Bone marrow pale
Histopathology Infiltration of liver and spleen with myelocytes
Aetiology Retrovirus Avian Leukosis Virus (ALV) Sub-group "J" (ALV-J) Meat type birds – more susceptible
Transmission Vertical Horizontal – hatcher – etc.
Control Free breeders Extensive testing of primary breeders Gsa test of cloacal swabs Antibody and viremia test Gsa egg albumen Gsa on meconium Gsa on albumen Meat Breeder Males Avian – extensive testing program Arbor Acres – no problem Cobb – no problem Petersen – problem Ross – problem Shaver – no problem |
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