Bolaños J M, Forsberg M, Kindahl H, Rodriguez-Martinez H
Ministry of Agriculture, San José, Costa Rica.
Theriogenology. 1998 Feb;49(3):629-36. doi: 10.1016/s0093-691x(98)00013-2.
Suckled postpartum Zebu (Bos indicus) cows were exposed either to estrous females alone or together with bulls to determine if this regimen would stimulate the resumption of ovarian activity. The study was carried out on 60 Zebu cows. The animals were allocated at parturition to 1 of 3 treatment groups. Group FB cows (n = 14) were exposed to progestogen treated females (approximately 3 cows per progestogen treated cow) and a bull for 42 d. Group F cows (n = 31) were exposed to progestogen treated females and after 21 d a bull was introduced and remained with the group until the end of the experiment 21 d later. Estrus was induced with Syncro Mate B treatment and the cows were in estrus when introduced into Groups FB and F. Group N cows (n = 15) were introduced to a bull 21 d after the treatments had begun in Groups FB and F, and the bull remained with these cows until the end of the study. On average, resumption of ovarian activity occurred in 57% (8/14), 19% (6/31) and 7% (1/15) of the cows in Group FB, F and N, respectively, within 21 d after the start of treatments. The difference was significant between Group FB and Groups F and N (P < 0.05). During the second part of the experiment, in which the bull was introduced to Groups F and N, an additional 32% (10/31) of the cows in Group F and 33% (5/15) in Group N resumed ovarian activity. No cows in Group FB resumed ovarian activity during this period. There were significant differences in body condition between cows that resumed ovarian activity and those that remained in anestrus (P < 0.05). We conclude that biostimulation effectively enhanced resumption of ovarian activity in anestrous suckled Zebu cows. This technique offers a potentially useful and practical way to improve reproductive efficiency in anestrous Zebu cattle in the tropics.
对产后哺乳的瘤牛（印度野牛）母牛分别单独暴露于发情母牛或与公牛一起，以确定这种方式是否会刺激卵巢活动的恢复。该研究在60头瘤牛母牛上进行。这些动物在分娩时被分配到3个处理组中的1组。FB组母牛（n = 14）与经孕激素处理的母牛（每头经孕激素处理的母牛约搭配3头母牛）和1头公牛接触42天。F组母牛（n = 31）与经孕激素处理的母牛接触，21天后引入1头公牛并与该组母牛一起直至21天后实验结束。用Syncro Mate B处理诱导发情，母牛在被引入FB组和F组时处于发情期。N组母牛（n = 15）在FB组和F组开始处理21天后引入1头公牛，公牛一直与这些母牛在一起直至研究结束。平均而言，在处理开始后的21天内，FB组、F组和N组中分别有57%（8/14）、19%（6/31）和7%（1/15）的母牛恢复了卵巢活动。FB组与F组和N组之间的差异显著（P < 0.05）。在实验的第二部分，即向F组和N组引入公牛后，F组中另外32%（10/31）的母牛和N组中33%（5/15）的母牛恢复了卵巢活动。在此期间，FB组没有母牛恢复卵巢活动。恢复卵巢活动的母牛与仍处于乏情期的母牛在体况上存在显著差异（P < 0.05）。我们得出结论，生物刺激有效地促进了哺乳的乏情瘤牛母牛卵巢活动的恢复。该技术为提高热带地区乏情瘤牛的繁殖效率提供了一种潜在有用且实用的方法。
