Browning R, Leite-Browning M L, Neuendorff D A, Randel R D
Texas Agricultural Experiment Station, Overton 75684, USA.
J Anim Sci. 1995 Sep;73(9):2558-63. doi: 10.2527/1995.7392558x.
Calves born to Angus (A), Brahman (B), or Tuli (T) bulls and B cows were evaluated to determine sire breed of calf effects on preweaning calf growth and reproductive performance of their dams. Records from 242 cow-calf pairs over 2 yr were used to assess birth weight, calf ADG, weaning weight, gestation length, and postpartum interval to estrus (PPI). The sire breed x sex of calf interaction was important (P < .05) for birth weight, weaning weight, and gestation length. Birth weights of BB males (32.8 +/- .8 kg) were significantly heavier than for AB and TB males (30.1 +/- .9 and 28.6 +/- .7 kg, respectively) and BB females (29.4 +/- .7 kg). As a main effect, sire breed of calf affected (P < .05) calf ADG, weaning weight, gestation length, and PPI. Calf ADG and weaning weights were greater for AB (.90 +/- .01 kg/d; 220.9 +/- 3.5 kg) than for TB (.81 +/- .01 kg/d; 200.4 +/- 3.0 kg) and BB calves (.78 +/- .01 kg/d; 198.8 +/- 3.5 kg). Gestation lengths differed (P < .01) among all calf genotypes (284, 288, and 294 +/- 1 d for AB, TB, and BB, respectively). Postpartum intervals were shorter (P < .05) for cows nursing BB calves (83 +/- 4 d) than for cows nursing AB (95 +/- 5 d) and TB calves (97 +/- 4 d). Tuli-sired F1 calves were inferior to Angus-sired F1 calves and similar to straightbred Brahman calves in preweaning growth. Crossbred calves had shorter gestations but longer postpartum intervals than purebred calves.
对安格斯（A）、婆罗门（B）或图利（T）公牛与B母牛所生的犊牛进行评估，以确定犊牛的父本品种对断奶前犊牛生长及其母牛繁殖性能的影响。利用2年期间242对母牛 - 犊牛的记录来评估出生体重、犊牛平均日增重（ADG）、断奶体重、妊娠期长度以及产后发情间隔（PPI）。犊牛的父本品种×性别交互作用对出生体重、断奶体重和妊娠期长度具有重要影响（P < 0.05）。BB雄性犊牛的出生体重（32.8±0.8千克）显著高于AB和TB雄性犊牛（分别为30.1±0.9千克和28.6±0.7千克）以及BB雌性犊牛（29.4±0.7千克）。作为主要效应，犊牛的父本品种对犊牛ADG、断奶体重、妊娠期长度和PPI有影响（P < 0.05）。AB犊牛（0.90±0.01千克/天；220.9±3.5千克）的犊牛ADG和断奶体重高于TB犊牛（0.81±0.01千克/天；200.4±3.0千克）和BB犊牛（0.78±0.01千克/天；198.8±3.5千克）。所有犊牛基因型的妊娠期长度存在差异（P < 0.01）（AB、TB和BB分别为284、288和294±1天）。哺育BB犊牛的母牛产后间隔（83±4天）比哺育AB犊牛（95±5天）和TB犊牛（97±4天）的母牛短（P < 0.05）。在断奶前生长方面，图利父本的F1犊牛不如安格斯父本的F1犊牛，且与纯种婆罗门犊牛相似。杂交犊牛的妊娠期比纯种犊牛短，但产后间隔更长。
