Data for this study were taken on the reproductive performance of 86 first-generation female progeny in the Dairy Cattle Crossbreeding Project of the Illinois Agricultural Experiment Station. The seven measures used were services per conception, age at first calving, interval from first service to conception, gestation length, calving interval, calving date to first heat, and calving date to first service.
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Verley et al. (1961) studied this question.
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