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Relationship Between Milk and Fat Production, Type, and Stayability in Holstein Sire Evaluation

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

Evaluations for milk, fat, 48- and 72-mo stayability, and official type classification on 1,053 Holstein sires from the United States and Canada were analyzed for relationships between sire evaluations for these traits. Although sire evaluations have been modified in both the Northeast Artificial Insemination Sire Comparison and the method by which type evaluations are calculated, correlations between milk and 48- and 72-mo stayability were .27 and .35, which indicates milk yield and stayability are positively correlated. Predicted difference final score and stayability were unrelated. Milk evaluations and predicted difference type had a correlation of —.26. Regressions predicting 48- and 72-mo stayability indicated milk alone accounted for 8 to 13% of variation in sire evaluations for stayability. Within the top 10% of the sires for milk yield, predicted difference type accounted for 7 to 11% of stayability variation, but milk and stayability evaluations were unrelated. Stayability differences between sires in the top 15% for transmitting particular trait characteristics and remaining sires were small, never exceeding 3% of the mean of the stayability evaluations.