Cows are kept in dairy herds as long as they are productive. Obviously, cow's production while they are in the herd (lifetime) affects the monetary return to the farmer. Literature on genetics of lifetime milk production is meager (Gill and Allaire 1976, Moque and Hodges 1980). A national dairy cattle breeding project in Canada (McAllister et al. 1978), being undertaken in part to study lifetime milk (protein) production of crossbreds relative to purebreds, needs many years for completion.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 33–38, 1982
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