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Journal of Dairy Science Vol. 78 No. 10 2294-2298
© 1995 by American Dairy Science Association ®
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Two Retroviral Infections of Periparturient Holstein Cattle: A Phenotypic and Genetic Study

Johann C. Detilleux 1, Marcus E. Kehrli Jr. 2, A. E. Freeman 1, Cecelia A. Whetstone 2, and David H. Kelley 1

1 Iowa State University, Ames 50011
2 National Animal Disease Center, USDA-ARS, Ames, IA 50010-0070

Environmental and genetic factors affecting prevalences of antibodies to bovine leukosis virus and bovine immunodeficiency-like virus were studied on 137 periparturient Holstein cows selected for milk production. Environmental effects were obtained by logistic regression, and genetic parameters were determined using threshold animal models. Cows selected for high predicted transmitting ability for kilograms of milk fat plus protein had the highest prevalence of antibodies to bovine immunodeficiency-like virus and the lowest prevalence of antibodies to bovine leukosis virus. Heritability estimates for susceptibility to retroviral infections were close to zero.

Key Words: genetic • retroviral infection • cattle

Submitted on March 28, 1995
Accepted on May 9, 1995






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Copyright © 1995 by the American Dairy Science Association ®.