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Preweaning Breed-of-Sire Comparisons Involving The Senepol Breed of Cattle

1986; Oxford University Press; Volume: 62; Issue: 5 Linguagem: Inglês

10.2527/jas1986.6251247x

1544-7847

F. A. Thrift, D. E. Franke, D. K. Aaron,

Ruminant Nutrition and Digestive Physiology

Preweaning data collected at two locations (Kentucky, Louisiana) were utilized to evaluate breed-of-sire comparisons involving the Senepol breed of cattle. For the Kentucky study, calves sired by Senepol bulls were 1.3 kg heavier (P<.05) at birth than calves sired by Hereford bulls; however, weaning weights were similar for the two sire groups. For the Louisiana study, calves sired by Longhorn bulls were 5.3 kg lighter (P<.01) at birth, 20 kg lighter (P<01) at weaning and had weaning condition scores .5 unit less (P<.01) than the average of calves sired by Red Poll and Senepol bulls. Also, heifers exposed to Longhorn bulls weaned 23 kg less (P<.01) calf per heifer exposed than the average of heifers exposed to Red Poll and Senepol bulls. Calves sired by Red Poll bulls were 1.2 kg heavier (P<.01) at birth and 12 kg heavier (P<.01) at weaning than those sired by Senepol bulls; however, the Senepol-sired calves received higher (P<.01) condition scores at weaning. Heifers exposed to Red Poll bulls weaned 20 kg more (P<.05) calf per heifer exposed than did heifers exposed to Senepol bulls.