Comparison of fertility parameters in Romanov sheep synchronized with progesterone-based protocol plus PMSG or GnRH

Authors : Barış GÜNER, Ebru KARAKAYA BİLEN

Pages : 61-66

Doi:10.47748/tjvr.1120029

View : 13 | Download : 5

Publication Date : 2022-11-25

Article Type : Research Paper

Abstract :Objective: The aim of this study was to compare the fertility parameters in response to pregnant mare serum gonadotropin insert ignore into journalissuearticles values(conventional treatment); or gonadotrophin-releasing hormone insert ignore into journalissuearticles values(alternative treatment); in Romanov sheep subjected to a 7-d short-term protocol out of breeding season. Materials and Methods: Sheep insert ignore into journalissuearticles values(n=57); received an intravaginal sponge impregnated with 20 mg fluorogestone acetate for 7 days and 125 µg cloprostenol at sponge removal. Sheep were randomly assigned to receive no treatment insert ignore into journalissuearticles values(CON, n=16);, 240 IU pregnant mare serum gonadotropin insert ignore into journalissuearticles values(PMSG, n=24); at sponge removal or 10 µg busereline acetate insert ignore into journalissuearticles values(GnRH, n=17); at 30 h after sponge removal. Results: Estrous response and pregnancy rate were 86% and 75.4% in all sheep, respectively. Estrous response was numerically higher about 7% insert ignore into journalissuearticles values(p>0.05); in treatment groups insert ignore into journalissuearticles values(PMSG, 87.5%; GnRH, 88.2%); than CON insert ignore into journalissuearticles values(81.2%);. However, pregnancy rate was numerically higher in PMSG insert ignore into journalissuearticles values(83.3%); than GnRH insert ignore into journalissuearticles values(70.6%); and CON insert ignore into journalissuearticles values(68.7%);. As in pregnancy rate, lambing rate was approximately 15% numerically greater insert ignore into journalissuearticles values(p>0.05); in the PMSG insert ignore into journalissuearticles values(79.1%); than in GnRH insert ignore into journalissuearticles values(64.7%); and CON insert ignore into journalissuearticles values(62.5%); groups. Similarly, litter size numerically higher insert ignore into journalissuearticles values(p>0.05); in PMSG insert ignore into journalissuearticles values(2.1); than GnRH insert ignore into journalissuearticles values(1.9); and CON insert ignore into journalissuearticles values(1.9); groups. Conclusion: The use of GnRH offered similar estrous response compared to PMSG in Romanov sheep synchronized with short-term protocol. However, PMSG had numerically higher pregnancy rate, lambing rate, and litter size than GnRH. Considering the serious ethical concerns and animal welfare for the production of PMSG, it is necessary to use alternatively gonadotropins. Comprehensive studies are needed to compare the fertility parameters between PMSG and GnRH in Romanov sheep.
Keywords : PMSG, GnRH, fertility, Romanov, sheep