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Genetic and phenotypic relationships among fifteen measures of reproduction in dairy cattle
(Virginia Polytechnic Institute and State University, 1984)
Reproductive data from 30 research herds were on 31,132 breeding periods of 11,347 dairy cows. Cows were sired by 1,101 sires and had 66,184 services to 1,320 service sires. Several measures of reproductive pe.rformance ...