It is comprehensively recognized that reduced reproductive efficiency represents a great economic loss to dairy producers. Ovarian cysts and anestrus syndromes are considered the greatest significant causes of low reproductive efficiency in dairy herds worldwide as they detrimentally affect the longevity and profitability of dairy herd. Pregnancy rate is the best available single deciding parameter used for assessment of the reproductive efficiency at the herd level which measures the probability that open cows become pregnant per unit of time. So, the current study was planned to evaluate the suitability of using Ovsynch plus CIDR and G6G resynchronization protocols as an efficient treatment regimen for cystic ovarian diseased cows and anestrus cows, respectively, through comparing pregnancy rates of cystic ovarian diseased cows that subjected to Ovsynch supplemented with controlled internal drug release device with the pregnancy rate of healthy cows that subjected to a Presynch-Ovsynch synchronization protocol, as well as through comparing pregnancy rates of anestrus cows that subjected to G6G treatment protocol with the pregnancy rate of healthy cows. Moreover, possible factors such as breed, parity, and season which may affect the treatment success were also evaluated. The results of the current study revealed an overall mean pregnancy rate of 36.64%. Moreover, Simmental cows recorded a greater (p < 0.01) pregnancy rate (45.16%) than that recorded for Holstein cows (34.98%). A highly significant seasonal effect was observed, as a higher (p < 0.01) pregnancy rate was recorded for cows inseminated during cold months (39.54%) compared with that recorded for cows inseminated during hot months (29.18%). No significant differences were detected in the pregnancy rates among the three breeding programs; thence, the application of the G6G synchronization protocol for anestrus cows and Ovsynch-CIDR synchronization protocol for cows with ovarian cysts could be used as effective treatment regimens as they resulted in nearly the same pregnancy rates that recorded for healthy cows. In addition, the treatment response was highly influenced by cow’s breed, parity, and season of breeding.

中文翻译：

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亚热带条件下三种不同育种方案的泌乳奶牛的生育力反应

众所周知，繁殖效率的降低给乳品生产者带来了巨大的经济损失。卵巢囊肿和无情期综合征被认为是全球奶牛群繁殖效率低下的最重要原因，因为它们对奶牛群的寿命和盈利能力产生不利影响。妊娠率是用于评估牛群水平繁殖效率的最佳可用单一决定参数，它衡量每单位时间开放奶牛怀孕的概率。因此，目前的研究计划评估使用 Ovsynch 加 CIDR 和 G6G 再同步方案分别作为囊性卵巢病奶牛和无情奶牛的有效治疗方案的适用性，通过比较接受 Ovsynch 补充控制内部药物释放装置的囊性卵巢疾病奶牛的妊娠率与接受 Presynch-Ovsynch 同步方案的健康奶牛的怀孕率，以及通过比较接受无发情奶牛的怀孕率G6G 治疗方案与健康奶牛的妊娠率。此外，还评估了可能影响治疗成功的可能因素，例如品种、胎次和季节。目前的研究结果显示，总体平均妊娠率为 36.64%。此外，西门塔尔奶牛记录的妊娠率 (45.16%) 高于荷斯坦奶牛 (34.98%) 的妊娠率 (p < 0.01)。观察到非常显着的季节性效应，因为较高 (p < 0. 01) 与在热月授精的母牛 (29.18%) 相比，在寒冷月份授精的母牛记录的妊娠率 (39.54%)。三个育种项目的受孕率无显着差异；因此，对无发情奶牛应用 G6G 同步协议和对患有卵巢囊肿的奶牛应用 Ovsynch-CIDR 同步协议可作为有效的治疗方案，因为它们产生的妊娠率几乎与健康奶牛记录的相同。此外，处理反应受奶牛品种、胎次和繁殖季节的影响很大。对无发情奶牛应用 G6G 同步协议和对患有卵巢囊肿的奶牛应用 Ovsynch-CIDR 同步协议可作为有效的治疗方案，因为它们导致与健康奶牛记录的妊娠率几乎相同。此外，处理反应受奶牛品种、胎次和繁殖季节的影响很大。对无发情奶牛应用 G6G 同步协议和对患有卵巢囊肿的奶牛应用 Ovsynch-CIDR 同步协议可作为有效的治疗方案，因为它们导致与健康奶牛记录的妊娠率几乎相同。此外，处理反应受奶牛品种、胎次和繁殖季节的影响很大。