西门塔尔牛定时人工输精技术研究

Study on Timed Artificial Insemination in Simmental Cattle

为探索不同定时输精方案、不同体况评分、不同输精剂量、是否经产对规模养殖场西门塔尔母牛定时人工输精效果的影响,试验选取103头母牛,按照体况评分、是否经产随机分为2个试验组,经不同定时输精方案及输精剂量处理后,统计相关繁殖性能。结果表明,Presynch-Ovsynch方案处理组同期发情率及单个情期受胎率要高于Ovsynch方案处理组,差异不显著(P>0.05);BCS评分6~7分单个情期受胎率高于4~5分组,达到64.29%以上,评分6分的母牛同期发情率显著高于4分组(P<0.05);初产母牛同期发情率和单个情期受胎率高于经产母牛,但差异不显著(P>0.05);高剂量输精母牛单个情期返情率低于低剂量组,单个情期受胎率高于低剂量组,差异显著(P<0.05)。

In order to explore the effects of different timed insemination plans,different body condition scores,different insemination doses,and whether or not to undergo labor on the effect of timed artificial insemination of Simmental cows in large-scale breeding farms,this experiment selected 103 cows and randomly divided them into two experimental groups based on body condition scores and whether or not to undergo labor.After different timed insemination plans and insemination doses,the relevant reproductive performance was statistically analyzed.The results showed that the Presynch Ovsynch regimen treatment group had a higher synchronous estrus rate and single estrus conception rate than the Ovsynch regimen treatment group,with no significant difference(P>0.05);The BCS score of 6~7 points showed a higher single estrus conception rate compared to the 4~5 points,reaching over 64.29%.The synchronous estrus rate of cows with a score of 6 points was significantly higher than that of the 4 points(P<0.05);The synchronous estrus rate and single estrus conception rate of primiparous cows are higher than those of multiparous cows,but the difference was not significant(P>0.05);The single estrus return rate of high-dose insemination cows was lower than that of the low-dose group,and the single estrus conception rate was higher than that of the low-dose group,with significant differences(P<0.05).