Abstract
First lactation milk production is affected by management during the raising period prior to first calving as well as during lactation. Genetics, feeding, breeding, health and other issues combine to determine the size and age at first calving. Commonly stated goals for raising replacement heifers include a first calving age of approximately 23-24 months and 82-85% of expected mature body weight. The objective was to quantify the relationship between differences in actual vs. targeted weight at first calving and subsequent 305d milk production.
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