Faculty of Veterinary Medicine, Banat's University of Agricultural Sciences and Veterinary Medicine 'The King Michael I of Romania' from Timisoara, Timis, Romania.
Bradano River' Dairy Buffalo Farm, Irsina, Italy.
Reprod Domest Anim. 2021 Dec;56(12):1511-1518. doi: 10.1111/rda.14013. Epub 2021 Sep 16.
The objective of this project was to report the effects of season and age on conception rate amongst Italian Mediterranean Buffalo subjected to an Ovsynch/Resynch (O/R) reproductive management protocol. The study utilized nulliparous (heifers), primiparous buffalo cows (PBC) and multiparous buffalo cows (MBC). The primiparous and multiparous groups were subjected to the synchronization protocol throughout the entire year, but heifers were synchronized and inseminated only during the spring/summer seasons. The conception rate obtained following the OvSynch oestrus synchronization protocol, applied during spring, was 68.4% for heifers, 83.3% for PBC and 67.7% for MBC. The overall total conception rates following the complete O/R protocol were 84.27%, 94.4% and 79%. Conception rates achieved during summer were heifers 52%, PBC 47.2% and MBC 49%, whilst overall conception rates following the full O/R protocol were 72%, 69.8% and 58.2% respectively. In the autumn seasons, PBC conceived 58.9% and MBC 52.1% following initial Ovsynch, which improved to total overall conception rates of 87.5% and 78.7% following the full O/R protocol. Similarly, in the winter season, PBC experienced a conception rate of 47.5% following Ovsynch and 72.5% after a follow-up Resynch. MBC experienced 60.0% and 74.4% conception following Ovsynch and full O/R, respectively, during winter. Total conception rates during all seasons were quite acceptable following the O/R protocol. There was a significant decrease from spring to summer in conception rate for all parity groups, but heifers were not a severely affected as older buffalo cows. This finding agrees with that of other investigators indicating that heifer fertility is not as negatively impacted by long photoperiod and higher ambient temperature as that of older animals. The O/R protocol as utilized in this study is an effective means of reproductive management for dairy buffalo cows and is effective for improving fertility during out-of-season breeding.
本项目旨在报告季节和年龄对意大利地中海型水牛在接受 Ovsynch/Resynch（O/R）繁殖管理方案后的受孕率的影响。该研究使用了初产（小母牛）、经产水牛牛（PBC）和经产水牛牛（MBC）。初产和经产组全年都接受同步方案，但小母牛仅在春季/夏季进行同步和授精。在春季应用 Ovsynch 发情同步方案后获得的受孕率为小母牛 68.4%、PBC 83.3%和 MBC 67.7%。完整 O/R 方案后的总体受孕率分别为 84.27%、94.4%和 79%。夏季小母牛的受孕率为 52%，PBC 为 47.2%，MBC 为 49%，而完整 O/R 方案后的总体受孕率分别为 72%、69.8%和 58.2%。在秋季，PBC 经初始 Ovsynch 后的受孕率为 58.9%，MBC 为 52.1%，之后完整 O/R 方案的总体受孕率分别提高至 87.5%和 78.7%。同样，在冬季，PBC 经 Ovsynch 后的受孕率为 47.5%，经后续 Resynch 后的受孕率为 72.5%。MBC 经 Ovsynch 和完整 O/R 后的受孕率分别为 60.0%和 74.4%。所有季节的 O/R 方案后的总受孕率都相当令人满意。所有胎次组的受孕率从春季到夏季都有显著下降，但小母牛的受影响程度不如老年水牛严重。这一发现与其他研究人员的发现一致，即小母牛的生育能力受长光照期和较高环境温度的影响不如老年动物严重。本研究中使用的 O/R 方案是一种有效的奶牛水牛繁殖管理手段，对于提高非季节性繁殖的生育能力是有效的。
