Genetic parameters were estimated for test day log transformed somatic cell scores (SCS) and their relationship with test day production traits and type traits in Holstein dairy cows. Data were analyzed using a multi-trait REML procedure with an animal model. Heritabilities for first lactation individual test day SCS were low (.06 to .10). Genetic correlations between SCS and milk yield and protein yield were positive (.10 to .58), zero between SCS and fat yield, negative between SCS and fat content (-.1 to -.45), negative between SCS and protein content in early lactation (-.08 to -.49), but positive in the last part of the first lactation (.17 to .30). SCS showed desirable negative genetic correlations to some udder type traits, such as fore attachment, rear attachment, median suspensory, and fore teat placement.

R. Reents, Jack CM Dekkers, Larry R Schaeffer

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 120–123, 1994
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