Investigation of Reproduction Rate In 3 Treatment Methods of Anestrous Ewes of Breading Season

摘要

Background: Reproduction is important in sheep herds. Relatively short term of ewepregnancy as compared with cow allow to pregnant two times in a year. Handling ofluteal phase or follicular phase of estrous cycle is necessary for estrous synchronization.Objective: To investigate reproduction rate in anestrous ewes out of breading season(April-May) we used CIDR and PMSG treatment methods. Results: Ninety healthyanestrous sheep (60 days after parturition) studied with same age, weight, twin birthhistory, body status and production. All of sheep are flushing 14 days before and 14days after treatment. Then the sheep divided to three groups randomly: The first groupof sheep: it is prescribed 400 unit (ecG)PMSG hormone to every sheep. In the secondgroup (ecG)CIDR was used in day zero, CIDR has removed at 14th day and prescribed400 unit PMSG hormone. Third group was received CIDR at day zero and prescribed1ml cloprocentol (PGF2α) and removed CIDR in 14th day and prescribed 400 unit(ecG)PMSG simultaneously. The results of this study showed that estrous rate ofanestrous ewes is better when used CIDR (group2, 3) instead of PMSG, but fertility ratewas not different between groups. Conclusion: Our data indicated that the second andthird treatment groups of anestrous ewes didn't show significant difference in view ofestrous rate and fertility rate. Therefore, the second group method is more cost effectivethan third group. So use of CIDR to treat of anestrous ewes is better than usage ofPMSG.