Effects of PMSG on estrus synchronization and reproductive rate of Gansu alpine fine-wool sheep

In the present study, the rates of both estrus synchronization and reproduction of Gansu alpine-fine-wool ewes were investigated after CIDR(Intravaginal Progesterone Insert) and PMSG(Pregnant Mare Serum Gonadotropin) combination treatment in Kangle Town, Sunan County, Gansu Province. The ewes had the highest estrus rate (P<0.05) in 48 hours under treatment with 550 IU PMSG injection after 12.5 days of using CIDRs and removing them in the 14th day compared with other treatments. The ewes had the highest reproductive rate (P<0.05) under treatment with 600 IU PMSG injection after 13 days of using CIDRs and removing them at the same time. However, the former treatment was optimal if considering both reproductive rate and economic benefits which had 773.7 CNY net income of per ewe.