Thrift F A, Franke D E, Aaron D K
J Anim Sci. 1986 May;62(5):1247-54. doi: 10.2527/jas1986.6251247x.
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 less than .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 less than .01) at birth, 20 kg lighter (P less than .01) at weaning and had weaning condition scores .5 unit less (P less than .01) than the average of calves sired by Red Poll and Senepol bulls. Also, heifers exposed to Longhorn bulls weaned 23 kg less (P less than .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 less than .01) at birth and 12 kg heavier (P less than .01) at weaning than those sired by Senepol bulls; however, the Senepol-sired calves received higher (P less than .01) condition scores at weaning. Heifers exposed to Red Poll bulls weaned 20 kg more (P less than .05) calf per heifer exposed than did heifers exposed to Senepol bulls.
在两个地点（肯塔基州、路易斯安那州）收集的断奶前数据用于评估涉及塞内波尔牛品种的父本品种比较。对于肯塔基州的研究，塞内波尔公牛所生的犊牛出生时比赫里福德公牛所生的犊牛重1.3千克（P小于0.05）；然而，两个父本组的断奶体重相似。对于路易斯安那州的研究，长角牛公牛所生的犊牛出生时轻5.3千克（P小于0.01），断奶时轻20千克（P小于0.01），断奶时的体况评分比红波尔和塞内波尔公牛所生犊牛的平均评分低0.5分（P小于0.01）。此外，接触长角牛公牛的小母牛每头所产断奶犊牛比接触红波尔和塞内波尔公牛的小母牛平均少23千克（P小于0.01）。红波尔公牛所生的犊牛出生时比塞内波尔公牛所生的犊牛重1.2千克（P小于0.01），断奶时重12千克（P小于0.01）；然而，塞内波尔公牛所生的犊牛在断奶时的体况评分更高（P小于0.01）。接触红波尔公牛的小母牛每头所产断奶犊牛比接触塞内波尔公牛的小母牛多20千克（P小于0.05）。
