Effects of FSH and PMSG on the prolificacy in sheep
In order to analyze the effects of reproductive hormones follicle stimulating hormones(FSH)and pregnant mare serum gonadotropins(PMSG)on prolificacy in sheep and the improvement of the reproductive performance of ewes,experiments were conducted using 530 Bayinbrook sheep,158 Altay sheep,246 Duolang sheep,and 458 German Merino sheep.On day 12 to 13 of estrus cycle of ewes,intramuscular injection of FSH or PMSG is administered.The insemination was following the onset of estrus and pregnancy test.The data of lambing status of ewes was collected during lambing.The results showed that the prolific rates of both Altay sheep and German Merino sheep were over50%,and the prolific rates of both Bayinbrook sheep and Duolang sheep were over 30%by intramuscular injection of FSH 150 IU;the lambing rate,prolific rate,and twin rate of Bayinbrook sheep in non-breeding season were lower than in breeding season with intramuscular injection of FSH 150 IU.The lambing rate,multiple lambing rate and double lambing rate in breeding season were significantly higher than those in non-breeding season after FSH 150 IU/sheep were injected into Bayanbulak sheep(P<0.05).The lambing rate of Bayanbulak sheep with one intramuscular injection of FSH150 IU/sheep was significantly higher than that of PMSG 450 IU/sheep(P<0.05).The lambing rate of Bayanbulak sheep injected with FSH 100 IU/sheep in the morning and evening(total 200 IU/sheep)was significantly higher than that of FSH 150 IU/sheep injected once(P<0.05).
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