2010, Cilt 26, Sayı 1, Sayfa(lar) 039-043
Recipient synchronization with various prostaglandin F protocols for embryo transfer in cows
Mesut Kırbaş1, Şükrü Dursun1, Mehmet Köse1, Bülent Bülbül1, Mehmet Çolak1, Hasan Mutlu2
1Bahri Dağdaş Uluslararası Tarımsal Araştırma Enstitüsü, Konya, Türkiye
2Çukurova Tarımsal Araştırma Enstitüsü, Adana, Türkiye
Keywords: Embryo transfer, recipient synchronization, prostaglandin, cow
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Aim: In this study, recipient synchronization with various prostaglandin F protocols for cryopreserved embryo transfer was examined.

Materials and Methods: A total of 46 Brown Swiss cows assigned randomly into three groups. Group I (n=15) cows injected 0.150 mg cloprostenol intramuscularly at random stage of the oestrus cycle. Following the injections, cows were observed for oestrus for 5 days. The other cows were received two 0.150 mg I.M. injections of cloprostenol 11 (Group II, n=15) or 14 (Group III, n=16) days apart. In Group II and III, cows were observed for oestrus for 5 days after the last injections. All cows were transferred embryos cryopreserved by ethylene glycol on d 7 (oestrus 0). Pregnancy diagnoses were performed on d 28 by ultrasonography.

Results: Injection-oestrus intervals and pregnancy rates were 56.13±4.37 h and 53.3%; 62.40±3.42 h and 46.7%; 70.75±3.08 h and 43.8% in groups I, II and III, respectively. Injection-oestrus interval was lower in Group I than in Group III (p<0.05) and was similar between groups I and II and groups II and III (p>0.05). The differences in pregnancy rates among groups were not significant (p>0.05).

Conclusions: All synchronization protocols evaluated in this study can be used for oestrus synchronization for cryopreserved embryo transfer in cows.