Veteriner Hekimlikte Araştırma Dergisi / Journal of Research in Veterinary Medicine

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    The effect of progesterone based ovsynch protocol and gnrh treatment after artificial insemination on conception rate in repeat breeder cows
    (Uludağ Üniversitesi, 2010-12-30) Taşdemir, Umut; Çelik, Yakup; Okut, Hayrettin; Keskin, Abdulkadir; Gümen, Ahmet; Mecitoğlu, Gülnaz Yılmazbaş; Karakaya, Ebru; Uludağ Üniversitesi/Veteriner Fakültesi.
    The aim of this study was to test the combined treatment protocol for improving fertility in repeat breeder cows by eliminating most of the hormonal etiological factors. Total 238 clinically healthy lactating dairy cows were included in the study; 175 dairy cows had more than three services (Repeat Breeder Cows) and 63 dairy cows had less than three services (Normal Cows). Ovsynch protocol was applied at random stages of the estrous cycle to all cows and exogenous progesterone (ear implant) was applied between GnRH and PGF2α of Ovsynch. In addition, GnRH was administrated seven days after artificial insemination (GnRH–progesterone– 7d–PGF2α–2d–GnRH–16h–AI–7d–GnRH). Response to the first GnRH of Ovsynch was greater (P<0.003) in repeat breeders (70.9%) than in normal cows (49.2%). However percentages of cows to responded to 2nd and 3rd GnRH were not different between groups (97.1%, 83.9% in repeat breeders and 98.4%, 87.1% in normal cows, respectively). Conception rates were similar at 31 and 62 d between groups (44.0%, 40.6% in repeat breeders and 47.6%, 42.9% in normal cows, respectively). In addition, embryonic loss was also similar in groups (7.8% in repeat breeders and 10.0% in normal cows). Thus, conception rate and response to hormonal treatments of the combined protocol except first GnRH were found to be similar in both repeat breeder and normal cows. So the combined protocol could be effective treatment for improving conception rate in repeat breeder cows.