ÇINAR, Mahmut Niğde Üniversitesi - Bor Meslek Yüksekokulu, ‎Turkey , YILMAZ, Oktay Afyon Kocatepe Üniversitesi - Veteriner Fakültesi - Doğum ve Jinekoloji AD, Turkey , CEYHAN, Ayhan Niğde Üniversitesi - Bor Meslek Yüksekokulu, TURKEY , ERDEM, Hüseyin Selçuk Üniversitesi - Veteriner Fakültesi - Doğum ve Jinekoloji AD, Turkey

Effect of GnRH treatment applied on day 12 after timed artificial insemination on pregnancy rate in Holstein heifers

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In this study, the effect of GnRH treatment applied on day 12 after timed artificial insemination (TAI) on pregnancy rate was investigated in Holstein heifers. A total of 56 heifers was randomly divided into control (n=28) and experimental (n=28) groups. All heifers were treated with PGF2α analogue on days 0 and 14, GnRH analogue on day 16 and TAI was performed 16 h after GnRH injection. The experimental group was treated with additionally GnRH injection on day 12 after TAI, while control group did not receive any injection. Pregnancy diagnosis was determined by real-time ultrasonography on days 30 and 45 after TAI in heifers. The pregnancy rates were found as 60.7% and 57.1% in experimental and control groups, respectively. Although the pregnancy rate in the experimental group was determined to be higher than the control group, the difference between two groups was not statistically significant (P 0.05). In conclusion, it is suggested that the injection of GnRH applied on day 12 after TAI has no effect on pregnancy rate in Holstein heifers.

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Heifer , Pregnancy Rate , GnRH , PGF2α , TAI

Kocatepe Veterinary Journal

79