Browning R, Leite-Browning M L, Lewis A W, Randel R D
Texas Agricultural Experiment Station, Overton 75684-0290, USA.
Domest Anim Endocrinol. 1996 Nov;13(6):511-7. doi: 10.1016/s0739-7240(96)00088-4.
The literature indicates that sire breed of calf influences beef calf performance. However, there is little information concerning sire breed of calf effects on reproduction in beef cows. In this experiment, Angus (A), Brahman (B), or Tuli (T) bulls were bred to 136 Brahman (B) cows to examine sire breed of calf influence on peripartum hormone profiles and the length of postpartum anestrus. Cows were bled from 7 d prepartum to 28 d postpartum to determine peripartum hormone concentrations. Cows carrying AB calves had greater (P < 0.05) prepartum estradiol-17 beta concentrations than did cows carrying BB and TB calves. Prepartum and postpartum progesterone concentrations did not differ between cows with AB, BB, and TB calves. Cows with TB calves had lower (P < 0.01) 13,14-dihydro-15-keto-prostaglandin F2 alpha (PGFM) concentrations than did cows with AB and BB calves during the early postpartum period. Adjusting for birth weight removed the sire breed of calf effect on postpartum PGFM concentrations, but not prepartum estradiol-17 beta. Postpartum anestrus was shorter (P < 0.05) for cows nursing BB calves (84 +/- 6 d) than for cows nursing AB (101 +/- 6 d) or TB calves (110 +/- 7 d). Adjustment for estradiol or PGFM concentrations did not reduce sire breed of calf effects on the length of postpartum anestrus. Further work is heeded to determine how calf genotype may modulate the postpartum reproductive function of the dam.
文献表明，犊牛的父本品种会影响肉牛犊的性能。然而，关于犊牛父本品种对肉牛繁殖影响的信息却很少。在本试验中，选用安格斯（A）、婆罗门（B）或图利（T）公牛与136头婆罗门（B）母牛配种，以研究犊牛父本品种对围产期激素水平及产后乏情期长度的影响。在产前7天至产后28天采集母牛血液，测定围产期激素浓度。怀AB犊牛的母牛产前雌二醇-17β浓度高于怀BB和TB犊牛的母牛（P < 0.05）。怀AB、BB和TB犊牛的母牛产前和产后孕酮浓度无差异。产后早期，怀TB犊牛的母牛13,14-二氢-15-酮-前列腺素F2α（PGFM）浓度低于怀AB和BB犊牛的母牛（P < 0.01）。校正出生体重后，犊牛父本品种对产后PGFM浓度的影响消失，但对产前雌二醇-17β浓度的影响依然存在。哺乳BB犊牛的母牛产后乏情期较短（P < 0.05）（84±6天），短于哺乳AB犊牛的母牛（101±6天）和哺乳TB犊牛的母牛（110±7天）。校正雌二醇或PGFM浓度并未降低犊牛父本品种对产后乏情期长度的影响。需要进一步研究以确定犊牛基因型如何调节母体的产后生殖功能。
