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Journal of Dairy Science Vol. 75 No. 9 2549-2559
© 1992 by American Dairy Science Association ®
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Associations Between Milk Protein Polymorphisms and Milk Production Traits

Henk Bovenhuis 1, Johan A. M. Van Arendonk 1, and Siem Korver 1

1 Department of Animal Breeding, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands

Associations between milk protein genotypes and milk production traits were estimated from 6803 first lactation records. Exact tests of associated hypotheses and unbiased estimates of genotype effects were from an animal model. Milk protein genotype effects were estimated using a model in which each milk protein gene was analyzed separately (single-gene analysis) and a model in which all milk protein genes were analyzed simultaneously (multigene analysis).

The results of the two models indicate that some effects ascribed to certain milk protein genes in the single-gene analysis are not effects of the milk protein gene itself but of linked genes. Results from this study and from literature indicate that the K-casein gene or a very closely linked gene affects protein percentage, and the ß-lactoglobulin gene or a very closely linked gene affects fat percentage. Furthermore, effects of ß-casein genotypes on milk production, fat percentage, and protein yield were significant, and ß-lactoglobulin genotypes had significant effects on milk production and protein yield. It is less clear whether those effects are due to effects of milk protein genes themselves or to effects of linked genes.

Key Words: milk protein • genetic variants • milk production traits

Submitted on November 25, 1991
Accepted on April 10, 1992




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