同期发情-定时输精技术在湖羊与不同品种肉羊杂交中的应用研究OA

The experiment aims to study the application effect of simultaneous estrus-timed insemination technology in the hybridization of Hu sheep with different breeds of meat sheep,and to clarify the optimal technical parameters and hybridization mode.A total of 262 healthy non-pregnant and multiparous ewes were selected for the experiment to investigate the effects of different estrus treatment methods,insemination methods and insemination times at the same time on the conception and lambing of ewes,and to compare the birth weight of lambs born from the hybrid combinations of Hu sheep and different breeds.The results showed that the conception rate of the silicone plug treatment group(CIDR group)was significantly higher than that of the sponge plug treatment group(FGA group)(P<0.05),and the lambing rate was significantly lower than that of FGA group(P<0.05).The conception rate(66.67%)and multiple lambing rate(72.20%)in the vaginal cervical insemination group were significantly higher than those in the laparoscopic uterine horn insemination group(P<0.05).The conception rate and multiple lambing rate of ewes are the highest 51 hours after thrombectomy,which can be regarded as the optimal time point for insemination.The birth weights of single and multiple lambs in the hybrid combinations of Australian white sheep×Hu sheep,White Suffolk sheep×Hu sheep,and Nanqiu sheep×Hu sheep were significantly higher than those in the Hu sheep×Hu sheep combination(P<0.05),but there was no significant difference in the conception rate of ewes among different hybrid combinations(P>0.05).Studies have shown that the concurrent estrus-timed insemination technique combined with laparoscopic insemination technology can increase the utilization rate of crossbred sheep.