Occurrence of Myeloid leucosis in broiler breeder chickens

Myeloid leucosis (ML) was diagnosed in two different broiler breeder chickens farms. Necropsy examination of these affected birds revealed slightly soft, grey to white coloured nodules of varied size on peritoneum, inner surface of ribs, liver, mucosal surface of trachea and on the head of femur bones. Histopathological examination of the affected tissues revealed marked proliferation of myelocytes and had a large, vesicular and eccentrically placed nucleus where as cytoplasm was tightly packed with eosinophilic (pink) granules.