Three groups of cows which were similar in size and growth, but differed in level of milk provided to their calves, were studied. Higher milk intake resulted in a significant increase in weight at weaning, a large portion of which was maintained through slaughter. Reproductive performance of breeding females was not significantly affected by level of milk production under the pasturefeeding and management conditions observed in this study. The high milk group exceeded the medium and low groups in total 205-day milk intake of calves by 186 and 561 kg, respectively. The difference between the high and low groups in calf weaning weight was 16.9 kgj 13.6 kg was the difference of the same two groups in carcass weight following a fairly rapid postweaning growth. Days to first postpartum estrus, calving date, pregnancy percentage and calf-crop percentage were essentially the same in all three cow groups, however, calf-crop percentage did follow the expected result of poorer reproduction in higher milking cows (85, 86 and 89 in high, medium and low, respectively).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 113–118, 1986
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