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Journal of Dairy Science Vol. 75 No. 5 1342-1348
© 1992 by American Dairy Science Association ®
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Genetic Parameters for Yield Traits of Holsteins, Including Lactose and Somatic Cell Score

R. D. Welper 1 and A. E. Freeman 1

1 Department of Animal Science, Iowa State University, Ames 50011

First lactation milk, fat, protein, and lactose yields and percentage yields were analyzed using a multiple-trait sire model including herd-year-season, sire group, and age of cow as fixed effects. Somatic cell score was fit both as a fixed effect in the model and as an additional dependent variable in two analyses with almost identical results. Variance components were estimated using REML with an expectation-maximization algorithm including sire relationships. Lactose means ranged from 4.84 to 4.97% across three dairy breeds. Data used to estimate variance components were first lactation Holstein records collected from 1986 to 1988 from 5246 daughters of 392 AI sires. Heritability estimates were .30, .29, .27, and .26 for milk, fat, protein, and lactose yields; .45, .47, and .53 for fat, protein, and lactose percentage yields; and .16 for somatic cell score. Genetic correlations of lactose percentage with milk, fat, protein, fat and protein percentages, and somatic cell score were –.30, –.16, –.21, .10, .29, and –.11, respectively, and phenotypic correlations were –.08, –.02, .01, .11, .29, and –.15.

Key Words: lactose • somatic cell score • heritability • variance components

Submitted on March 25, 1991
Accepted on October 24, 1991




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