Michigan DHIA-IBM records for 4,677 Holsteins~ 1,001 Guernseys, and 501 Jerseys were used to fit constants by least squares for the independent influences of age and weight on production in the first lactation. These effects indicated that delaying calving of heifers is economically disadvantageous and that heavier heifers have little or no advantage over lighter heifers of similar age.
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Miller et al. (1959) studied this question.
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