Abstract: [Objective] To explore the application effect of timed insemination technology in the batch production of dairy sheep. [Method] The multiparous ewes of dairy sheep scale farms in Gansu province were selected for disease testing first, and the timed insemination tests were carried out after they were qualified. From July to December 2022, according to the actual situation of the sheep farm inventory and production arrangements, the simultaneous estrus + ostrus insemination mode test of 210 sheep in 5 batches and the timed insemination mode test of 26 batches and 1290 sheep were carried out to calculate the conception rate of each batch. [Result] The average participation rate of 5 batches of the same estrus + oestrus insemination model was 90%, the average participation rate was 82%, and the average batch pregnancy rate was only 74%.The batch conception rate of 26 batches in the timed insemination mode was 84%, and the flock utilization rate was improved by 10%. [Conclusion] The timed insemination mode is exempted from examination, which can reduce the work intensity and improve the batch conception rate.At the same time, it can effectively improve the utilization rate of ewes and the efficiency of breeding, and reduce the production cost of sheep farms. The batch conception rate is a better measure of the real efficiency of the mating work than the reference fertilization rate.

Key words: dairy sheep, sperm motility, timed insemination, conception rate