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A comparison of the subsequent reproduction of heifers that calved for the first time at 2 vs. 3 yr of age was conducted on a purebred Brahman herd from 1971 to 1978 in central Florida. Pregnancy rate, birth rate and weaning rate were obtained on 1,612 animals. Sire of the cow had a significant effect on all three reproduction traits, indicating possible genetic differences in these important traits. Age at first calving (either 2 or 3 yr) had no significant effect on overall reproduction rates; however, subsequent pregnancy and weaning rate was 4% higher in females calving first at 2 yr of age. Thirty-eight percent of the females that became pregnant at 15 to 17 mo of age, weighed 650 to 700 lbs. These heifers had been born early in the previous calving season. It is suggested that Brahmans can be selected to calve at 2 yr of age if good nutrition and management are provided.
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| http://dx.doi.org/10.1016/s0093-691x(88)80019-0 | DOI Listing |
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