Abstract:The application of semen control technology for high-quality Holstein dairy cows in our city is still in its early stages and is currently being promoted through trials.To evaluate the application of semen control technology in high-quality Holstein dairy cows of different parity,this study reviewed relevant literature and conducted demonstration trials using a timed artificial insemination(Ovsynch/TAI) program,Lintao County Harmony Animal Husbandry Technology Co.,Ltd.no reproductive disease,normal reproductive function,follicle development of the first fetus,the second and the third fetus between 20 high-quality Holstein cows as the test object,Using the fine tube of fine Holstein cow as the test material.Experimental studies on the concurrent estrus rate,pregnancy rate,calving rate and calf sex ratio of dairy cows with different parity.The results show that:(1)The first dairy cows had 20 estrus,with an estrus rate of 100%,the second cows were 18 with 90%,and the third cows had 16 with an estrus rate of 80%.(2)After 60 bred Holstein cows underwent two scheduled insemination procedures,20 cows were pregnant,the pregnancy rate was 100%,13 second cows were pregnant,the pregnancy rate was 65%,15 of the third cows were pregnant,the pregnancy rate was 75%.(3)Among the 60 cows of the company,there are 48 pregnant cows and 48 calves,the calving rate is 100%,45 surviving heads,and the survival rate is 93.8%.The study believes that the birth rate of young cows during the sperm control period is much higher than that of postpartum cows,the birth rate of female calves is more than 90%,the survival rate is also good,and the effect is obvious,which provides reference for the extensive application of sperm control technology in the process of dairy cow breeding.
