Effects of FGA sponge and ovsynch based protocols on reproductive performance of fat-tailed ewes during the breeding season

Sunulan çalışmada, aşım sezonundaki yağlı-kuyruklu koyunlarda farklı senkronizasyon protokollerinin reprodüktif parametreler üzerine etkileri araştırıldı. Bu amaçla, toplam 71 baş birden fazla doğum yapmış yağlı-kuyruklu koyun rasgele 4 deneme grubuna ayrıldı: Birinci gruptaki koyunlara (n=20, uzun süreli FGA), 20 mg FGA içeren süngerler intravaginal olarak yerleştirildikten sonraki 14. günde uzaklaştırılarak, 400 IU PMSG intramuskuler olarak enjekte edildi. İkinci gruptaki koyunlara (n=18, kısa-süreli FGA), 20 mg FGA içeren süngerler intravaginal olarak yerleştirildikten sonraki 8. günde uzaklaştırılarak, 400 IU PMSG intramuskuler olarak enjekte edildi. Üçüncü gruptaki koyunlara (n=17, Ovsynch grubu), Ovsynch protokolü (0. günde 0.004 mg GnRH, 7. günde 125 μg PGF2α ve 9. günde 0.004 mg GnRH) uygulandı. Dördüncü gruptaki koyunlara (n=16; kısa-süreli FGA + Ovsynch) ise, 20 mg FGA içeren süngerlerin intravaginal olarak yerleştirilmesiyle birlikte 0.004 mg GnRH enjekte edildi. Süngerlerin 7 gün sonra uzaklaştırılmasını takiben 125 μg PGF2α ve 9. günde 0.004 mg GnRH uygulandı. Senkronizasyon grupları arasında, son uygulama-östrus aralığı (P

Aşım Mevsimindeki yağlı kuyruklı koyunlarda FGA ve Ovsynch temelli senkronizasyon protokollerinin üreme performansı üzerine etkileri

The effects of different synchronisation prototocols on the reproductive parameters of fat-tailed ewes during the breeding season were studied herein. Seventy-one multiparous fat-tailed ewes were randomly divided into four treatment groups, as follows; Group 1 (long-term FGA): for a total of 20 ewes, 20 mg FGA sponges inserted intravaginally for 14 d, plus an i.m. injection of 400 IU PMSG upon the sponge withdrawal, Group 2 (short-term FGA): for 18 ewes, the insertion of sponges for 8 d, plus the PMSG injection on day 8 upon the sponge withdrawal, Group 3 (Ovsynch): for 17 ewes, an i.m. injection of 0.004 mg GnRH on day zero, followed by the injection of 125 μg PGF2α on day 7 and the second GnRH injection on day 9, and Group 4 (short-term FGA plus Ovsynch): for 16 ewes, the FGA sponge inserted along with the first GnRH injection (as day zero), PGF2α injection on day 7 upon the sponge withdrawal, and the second GnRH injection on day 9. The results showed that; time to onset of oestrus (P<0.001), duration of oestrus (P<0.05), the rates of pregnancy (P<0.01) and lambing (P≤0.001) differed between the synchronisation groups. Overall, findings of onset/duration of oestrus and pregnancy/lambing rates suggest that; the standard Ovsynch synchronisation programme was markedly inferior to the long- and short-term FGA sponge protocols in fat-tailed ewes during the breeding season.

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