Genetic marker-lactation trait investigations conducted in the Holstein and Guernsey breeds involved about 6000 cows in each breed. Associations of blood group, blood protein, and milk protein polymorphisms with yield and component content were examined using least squares techniques. Effects due to marker pleiotropy or tightly linked quantitative genes were examined at the population level, while effects of quantitative genes more distant from markers were evaluated within sire half-sib families. More associations were found with component content than with milk yield. The most conspicuous associations involved milk protein loci and component percentages. Transferrin, blood group F, and J x L interactions were significantly associated with several traits. The detected significant effects are considered in the context of the literature.

H. C Hines

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 121–124, 1990
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