Ümüt CİRİT, Melih UÇMAK, Özge YILMAZ TURNA, Serhat ALKAN, Güven KAŞIKÇI, Özen Banu ÖZDAŞ, Mehmet Can GÜNDÜZ

Tahirova koyunlarında modifiyec Ovsynch protokolünün senkronizasyon ve fertilite oranlarına etkisi

Tahirova koyunu süt verimi yüksek bir koyun ırkı olarak bilinmektedir. Günümüzde sığırların senkronizasyonu için kolay, ekonomik ve etkili yöntemler geliştirilmiştir. Bu çalışmada sığırlar için geliştirilen ovsynch protokolünün koyunlara uyarlanması amaçlandı. Bu amaçla 150 Tahirova koyunu ve 6 koç kullanıldı. Üreme mevsimindeki koyunlar rastgele 3 gruba ayrıldılar. Her bir koyuna 0. gün GnRh ve 6. gün PGF2α+PMSG uygulandı. Buna ilaveten ikinci gruptaki koyunlara 8. gün hCG, üçüncü gruptakilere ise 7,5. gün EP, 8. gün hCG uygulandı. Aşımlar, birinci grupta ilk gün %68, ikinci gün %32 oranında; ikinci grupta ilk gün %80, ikinci gün %8, üçüncü gün %12 oranında; üçüncü grupta ise ilk gün %72, ikinci gün %11, üçüncü gün %6 oranında gerçekleşti. Birinci grupta 48 doğumun 9’undan ikiz (%18,7), 39’undan tek; ikinci grupta 49 doğumun 11’inden ikiz (%22,4), 38’inden tek; üçüncü grupta 48 doğumun 5’inden ikiz (%10,4), 43’ünden tek kuzu elde edildi. Çalışmada, kullanılan modifiye Ovsynch protokolünün Tahirova koyunlarının reprodüktif performansı üzerine etkileri belirlenmiştir. Bu yöntemle, sığırlarda kullanışlı olan Ovsynch protokolü koyunlara uyarlanmış ve EWESYNCH olarak isimlendirilmiştir.

The effect of modified Ovsynch protocol on synchronization and fertility rate in Tahirova ewes

Tahirova ewes are known as a breed with high milk production. Nowadays, easy, economic and effective methods are developed for synchronization of cattle. The aim of this study was to adapt the Ovsynch protocol for cattle to the ewes. For this purpose 150 Tahirova ewes and 6 rams were used. The ewes in breeding season were randomly divided into three groups. On day 0 GnRh and day 6 PGF2α+PMSG administered to each of the ewes. In addition to this hCG was injected to the ewes of Group 2 and 3 on the 8th day and also estradiol propionat (EP) was administered to the ewes of Group 3 on the day 7.5. Matings have taken place in 68% of Group 1 on the first day and in 32% on the second day. These results were 80% on the first day, 8% on the 2nd day and 12% on the 3rd day in Group 2; 72% on the first day, 11% on the 2nd day and 6% on the 3rd day in Group 3. In Group 1 there were 9 twins (18.7%) out of 48 births. In Group 2 total 49 births, of which 11 twins (22.4%) and in Group 3, 5 (10.4%) of 48 births were twins. By the present study, the reproductive and breeding characteristics of Tahirova, a highly productive and adopted sheep have been determined and recorded. The ovsynch protocol which had been developed for dairy cattle have been modified for sheep and named as EWESYNCH.

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