绵羊同期发情技术应用效果探析

Analysis of the Application Effect of Synchronization Estrus Technology in Sheep

通过对东乡、广河和会宁等养羊大县的养殖场引进的常年发情的湖羊、小尾寒羊和季节性发情的本地滩羊等品种多批次的应用同期发情技术开展生产试验,研究常温人工授精及同期发情技术的应用效果。结果表明:(1)湖羊、小尾寒羊同期发情率达到96%、95%;利用人工授精技术对同期发情母羊配种,情期受胎率分别达到82%、80%,批次生产空胎率控制在2%以下,产羔率分别达到203%、227%,应用效果明显;季节性发情本地品种滩羊在非发情期同期发情技术应用效果差,同期率在20%以下,在发情期应用同期发情技术配种,同期率达到91%、情期受胎率达到75%、产羔率达到77.5%,应用效果尚可;(2)在不同品种与湖羊和小尾寒羊杂交后代中,小尾寒羊表现的杂交优势更为明显,其杂交羔羊初生重、断奶重和6月龄重均高于湖羊,最佳杂交组合为澳洲白×小尾寒羊。研究认为,具有常年发情特性的湖羊、小尾寒羊在规模羊场应用同期发情技术开展批次化节律生产效果明显,可大力推广应用;季节性发情的滩羊、高山细毛羊等绵羊品种在繁殖季应用同期发情技术效果较明显,在非繁殖季技术应用效果差,不推荐应用。

Through the application of synchronized estrus technology in multiple batches of imported long-yearling Hu sheep,small tail cold sheep,and local tan sheep from Dongxiang,Guanghe,and Huining,which are major sheep-raising counties,and the study of the application effect of room-temperature artificial insemination and synchronized estrus technology.The results show that:(1)Statistical test data analysis of lake sheep,small tail cold sheep in the same period of 96%,95%.Using arti-ficial insemination technology to breed concurrent estrous ewes.The conception rate reached 82%and 80%respectively.The rate of batch production is controlled below 2%.The lambing rate reached 203%,227%,respectively.The application effect is obvious.Poor application effect of the local breed tan sheep in the non-estrus period.The period rate below 20%.Apply the same estrus technology in estrus.The same period rate reached 91%,the abortion rate reached 75%,the lambing rate reached 77.5%.The application effect is still good.In the crossbreeding offspring of different breeds with the Hu sheep and small tail cold sheep,the small tail cold sheep showed more obvious hybrid advantage,with their hybrid lambs having higher birth weight,weaning weight,and 6-month weight than the Hu sheep.The optimal hybrid combination was Austrilia uhite×small tail cold sheep.The study concluded that Lake sheep and small tail cold sheep with perennial estrus characteristics have obvious effect of applying the simultaneous estrus technology in the scale sheep farm,which can be vigorously promoted and applied.Seasonal estrous tan sheep,alpine fine wool sheep and other sheep varie-ties have obvious effect in the same estrous technology,but poor application effect in the non-breeding season,which is not recommended.