Somatic cell score

Impact of bovine somatotropin on ranking for genetic value of dairy sires for milk yield traits and somatic cell score

A. Al-Seaf, Keown, J. F., and Van Vleck, L. D., Impact of bovine somatotropin on ranking for genetic value of dairy sires for milk yield traits and somatic cell score, vol. 6, pp. 79-93, 2007.

Records of Holstein cows were used to examine how different models account for the effect of bovine somatotropin (bST) treatment on genetic evaluation of dairy sires for yield traits and somatic cell score. Data set 1 included 65,720 first-lactation records. Set 2 included 50,644 second-lactation records. Set 3 included 45,505 records for lactations three, four and five. Estimated breeding values (EBV) of sires were with three different animal models. With Model 1, bST administration was ignored. With Model 2, bST administration was used as a fixed effect.

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