عنوان مقاله [English]
نویسندگان [English]چکیده [English]
An investigation was under taken to evaluate the out of season reproduction performance of ewe. A flock consisting 119 ewes was synchronized via implementation CIDR over a period of 12 days, following by injection of PMSG (400 IU). The ewes inseminated and divided to three experimental groups. Group1: Injection of GnRH (5ml) at day 12 post insemination, group 2: Received CIDR for 5 to 15 days post insemination and group 3(control): ewes did not receive any treatment. Data were analyzed in Chi- Square method by SAS soft were. Fertility in group1, 2 and 3 were 40, 30 and 30.76 percent and fecundity were 65.0, 37.5 and 43.5 percent and twining rate were 62.5, 25.0 and 41.6 percent, respectively. Results reveal that supplementation of progesterone or GnRH would not enhance reproductive performance in the ewe in out of season.
Key words: GnRH, ewe, CIDR, fecundity, twining rate.