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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