Abstract

Data consisted of 227,725 breeding receipts confirmed for accuracy by Dairy Herd Improvement (DHI) records on 48,724 cows with at least one confirmed pregnancy. The cows were in 9,885 herd-years and were serviced by 1,231 technican-years using 984 sires. Evaluations on technician years, herd-years and sires varied by +2.9, +8.0, +2.9% conception, respectively. Parity-service number was the most important fixed effect varying by +9.6% conception. To evaluate semen fertility, it is essential to have herdyears, cows, and parity service number in the model in addition to service sires. Estimates obtained were similar to results from a larger data set unconfirmed by DHI milk recording records.
 

R. W Everett, J. F Taylor, B. Bean

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 61–65, 1986
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