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Avian Leukosis - Sarcoma Viruses and Antibody in Field Flocks, and Their Relationship to "Leukosis" Mortality

1969; American Association of Avian Pathologists; Volume: 13; Issue: 1 Linguagem: Inglês

10.2307/1588415

1938-4351

H. G. Purchase, J. J. Solomon, D. C. Johnson,

Animal Nutrition and Physiology

Two commercial flocks on separate farms were examined periodically for antibody to subgroup A avian leukosis viruses and for viremia. One farm had a history of high losses from diseases of the avian leukosis complex (ALC), and the other a history of low losses. Both Marek's disease (MD) and lymphoid leukosis (LL) contributed to the losses on the former farm. Maternal antibody in chicks delayed the onset of acquired antibody, and birds with maternal antibody and without viremia died of LL less frequently than birds with viremia and no maternal antibody. Incidence of LL was higher in birds that acquired antibody than in birds without acquired antibody. LL mortality tended to be higher among birds in which infection was detected (i.e. had viremia or acquired antibody at any time during the experiment) than in birds with no evidence of infection. Among the commercial birds, 15% showed no evidence of infection and 13% of sibling embryos were found to be resistant to RSV when challenged on the chorioallantoic membrane.