YAVUZ NAK, Bilginer TUNA, DENİZ NAK, Emin KARAKAŞ, Gözde ŞİMŞEK

The Effects of ovsynch, ovsynch with progestin and progestin plus double TAI on pregnancy rates in unobserved oestrus dairy cows and heifers

Bu çalışmanın amacı, östrusları belirlenememiş inek ve düvelerde ovsynch protokolüne progestin (norgestomet) ve çift sun’i tohumlama uygulamalarının eklenmesinin fertiliteyi arttırıp artırmadığını belirlemekti. Grup I (ovsynch): İnek (269) ve düvelere (152), GnRH (0. gün), PGF2α (7. gün), GnRH (9. gün) uygulandı ve ikinci GnRH uygulamasından yaklaşık 16 sat sonra sun’i tohumlama yapıldı. Grup II (Ovsynch, norgestomet): İnek (268) ve düvelere (152) grup I’ deki uygulamalara ek olarak ilk GnRH ile birlikte kulak implantı (norgestomet) takıldı ve implantlar PGF2α uygulanırken çıkarıldı. Grup III: İnek (268) ve düvelere (150) GrupII’ deki uygulamalara ek olarak,ilki ikinci GnRH uygulaması sırasında ve ikinciside yaklaşık 18-20 saat sonra olmak üzere çift sun’i tohumlama uygulandı. Doğal östrus gösterip tohumlanan 270 inek ve 153 düve kontrol grubu olarak değerlendirildi. Ovsynch protokolüne eklenen norgestomet içeren implantların, tedaviler başlamadan önce siklik ve nonsiklik olduğu belirlenen inek ve düvelerde gebelik oranlarını arttırmadığı tespit edildi. Grup III’deki düvelerin toplam gebelik oranının grup I, II, kontrol gruplarındaki düvelere ve III’cü gruptaki ineklere göre belirgin şekilde yüksek olduğu belirlendi.

Anahtar Kelimeler:

sığır, suni tohumlama, sığır yetiştiriciliği, inek, süt sığırı, süt ineği, prostaglandinler, dişi döl verimi, GnRH, düve, kızgınlık dönemi, kızgınlık, gebelik, gebelik oranları, üreme randımanı, dölverim performansı, eş zamanlama, senkronize edilmiş dişiler, sentetik hormonlar

Kızgınlıkları gözlenemeyen sütçü inek ve düvelerde, ovsynch, ovysnch - progestin, ovsynch - progestin - çift sun’i tohumlama uygulamalarının gebelik oranları üzerine etkileri

The objective of this study was to determine whether progestin (norgestomet) supplementation and double-timed artificial insemination (TAI) during the Ovsynch protocol enhances fertility in dairy cows and heifers when the state of oestrus was not determined. In group I (Ovsynch), cows (269), heifers (152) were treated with GnRH on day 0, PGF2α on day 7, GnRH on day 9. TAI was performed approximately 16 h after the second GnRH. In group II (Ovsynch, norgestomet), cows (268) and heifers (152) were treated as in group I, but the implant was received at the time of first GnRH. All implants were removed at the time of the PGF2α. Cows (268) and heifers (150) in group III were treated as in Group II, but a double TAI was performed. First TAI was administrated at the time of the second GnRH and the second TAI was administered approximately 18-20 h later. Cows (270) and heifers (153) detected as being in natural oestrus were used as untreated control animals. The use of the norgestomet implant at the same time as the Ovsynch protocol did not increase pregnancy rates in cows and heifers that were classified as cyclic or noncyclic before treatments began. Total pregnancy rates were significantly greater for group III heifers than for group I, II, control heifers and group III cows.

Keywords:

cattle, artificial insemination, cattle farming, cows, dairy cattle, dairy cows, prostaglandins, female fertility, GnRH, heifers, oestrous cycle, oestrus, pregnancy, pregnancy rate, reproductive efficiency, reproductive performance, synchronization, synchronized females, synthetic hormones,

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