不同季节不同生产因素对荷斯坦奶牛性控冻精人工输精受胎率的影响

为研究不同季节、不同胎次、不同发情方式及不同泌乳天数等因素对奶牛单个情期受胎率的影响，选取2169头奶牛进行统计分析。结果显示，奶牛秋冬季配种受胎率较春夏季高，冬季情期受胎率显著高于春、夏两季（P＜0.05），初产奶牛情期受胎率高于经产奶牛（P＜0.01），自然发情情期受胎率极显著高于同期发情药物处理奶牛（P＜0.01），不同泌乳阶段对受胎率影响不大（P＞0.05）。

The effect of different seasons and production factors on the conception rate of artificially inseminated frozen semen in Holstein cows

To study the effects of different seasons, parity, estrus patterns, and lactation days on the single estrus conception rate of cows, 2169 cows were selected for statistical analysis. The results showed that the conception rate of cows during autumn and winter mating was higher than that in spring and summer, and the conception rate during winter estrus was significantly higher than that in spring and summer (P<0.05). The conception rate during the estrus period of primiparous cows was higher than that of multiparous cows (P<0.01), and the conception rate during natural estrus was significantly higher than that of cows treated with estrus drugs during the same period (P<0.01). Different lactation stages had little effect on the conception rate (P>0.05).