季节和输精程序对罕山白绒山羊同期发情效果的影响OA

[Objective]By investigating the effects of season and insemination protocol on the efficacy of estrus synchronization in Hanshan white cashmere goats,this study aims to provide data support and a reference for the large-scale application of estrus synchronization technology in this breed.[Method]In this experiment,during both the non-breeding and breeding seasons,Hanshan white cashmere goats were randomly divided into two groups:the timely artificial insemination group and the timed artificial insemination group.Both groups received the P4-eCG protocol,in which a progesterone(P4)sponge was intravaginally implanted for 14 days,and equine chorionic gonadotropin(eCG)was intramuscularly injected at the time of sponge removal.In the timely artificial insemination group,estrus was detected using teaser rams,and artificial insemination was performed at 12 and 24 hours after estrus detection.In the timed artificial insemination group,two timed artificial inseminations were directly performed at 48 and 60 hours after sponge removal.[Result]The results indicated that there was no significant difference in the estrus synchronization rate between the breeding and non-breeding seasons following the estrus synchronization protocol(P>0.05).However,both the pregnancy rate and lambing rate were significantly higher during the breeding season compared to the non-breeding season(P<0.05).Both during the non-breeding season and the breeding season,there were no significant differences(P>0.05)in pregnancy rate and lambing rate between the timely artificial insemination group and the timed artificial insemination group.[Conclusion]In conclusion,the P4-eCG protocol achieved satisfactory estrus synchronization outcomes in Hanshan white cashmere goats,although pregnancy and lambing rates were significantly greater during the breeding season than in the non-breeding season.Considering operational convenience,the timed artificial insemination program is recommended.