Life Sciences Commons^™

Variance Caused By Cytoplasmic Line And Sire By Herd Interaction Effects For Milk Yield Considering Estimation Bias, P. R. N. Rorato, Jeffrey F. Keown, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

A total of 138,869 lactation milk yields (305 d, milked twice daily, mature equivalent) from the first three parities of 68,063 New York Holstein cows were used to estimate variance components that were due to additive direct genetic effects, cow permanent environmental effects (cow within sire for sire model), sire by herd interaction effects, and cytoplasmic line effects. The original data were assigned to 10 random samples, which were each analyzed using an animal model and a sire model. From each sample of original data, 20 other samples were analyzed with levels assigned randomly to cytoplasmic and interaction effects (data …