Abstract
Raising replacement heifers represents a major cost on a dairy farm. The ideal time to submit a heifer to insemination is a balance between reproductive biology, growth, and economics. While getting heifers pregnant sooner may reduce raising costs, it may compromise their future productive performance. The objective of this study is to compare the reproductive performance of Jersey heifers submitted for first insemination (AI) based on age vs. body weight (BW). We hypothesize that the reproductive performance of heifers moved to the breeding pen (BP) based on a minimum BW would not be inferior to that of heifers moved based on minimum age.
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