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Fırat Üniversitesi Sağlık Bilimleri Veteriner Dergisi
2006, Cilt 20, Sayı 5, Sayfa(lar) 365-369
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The effect of interval from first detected mounting activity to artificial insemination on conception rates in cows
Mustafa SÖNMEZ, Seyfettin GÜR, Emrah Hicazi AKSU
Fırat Üniversitesi Veteriner Fakültesi Dölerme ve Sun'i Tohumlama Ana Bilim Dalı, Elazığ-TÜRKİYE
Keywords: Cow, Mounting activity, Artificial insemination, Conception rate, Progesterone level

This study was conducted to investigate the effect of interval from first detected mounting activity to artificial insemination on conception rates in cows.

A total of 94 cows were used in this study. Cows were visually observed three times a day for behavioral signs of estrus. Progesterone levels were determined using progesteron test kits to confirm whether the cows were in estrus at insemination time. They were divided into three groups according to interval from first mounting activity to artificial insemination. Then, they were inseminated between 0 h and 8 h (Group I), 8 h and 16 h (Group II), 16 h and 24 h (Group III) after first detected mount. The conception rates were determined by rectal palpation on 55-60th days following artificial insemination.

The average rate of cows which showed behavioral signs of estrous but had high concentrations of progesterone (>1 ng/ml) was recorded as 16.0%in this study. It was observed that the conception rate was significantly lower in cows which inseminated within 8 h after first detected mount (p<0.05) than that of cows in other groups (42.9%vs. 78.1%and 73.1%, respectively).

In conclusion, the interval from first mounting activity to artificial insemination has an important role on conception rates in cows. In particularly, the insemination of cows within 8 h after first detected mounting activity may cause to reduce conception rates.


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