Effect of Different Seasons and Production Factors on the Conception Rate of Sexually Controlled Frozen Semen by Artificially Insemination in Holstein Cows
To study the effects of different seasons,parity,estrus patterns,lactation days,and other factors on the single estrus conception rate of cows,2169 cows were selected for the 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(P＜0.01).Different lactation stages had little effect on the conception rate(P＞0.05).
dairy cowconception rate during estrusparitynatural estrusseason
NETL
NSTL
万方数据
