Journal of Animal and Veterinary Advances

Year: 2010
Volume: 9
Issue: 4
Page No. 809 - 813

The Comparison of the Pregnancy Rates Obtained after the Ovsynch and Double Dose PGF + GnRH Applications in Lactating Dairy Cows

Authors : Gokhan Dogruer, Mustafa Kemal Saribay, Fikret Karaca and Yasar Ergun

Abstract: This study was carried out to compare the pregnancy rates in timed artificial inseminations after Ovsynch and PGF + GnRH applications on lactating dairy cows. The research was conducted in a commercial dairy farm on 84 lactating Holstein cows which the ages were ranging between 3-5 years old and between 80-120 days postpartum. The cows were randomly assigned to two groups as Ovsynch (n = 42) and Prosta Glandin (PG) (n = 42). The cows in Ovsynch group recieved 10.5 μg-1 GnRH at day 0, 500 μg-1 PGF at day 7 and 10.5 μg-1 GnRH at day 9 intramuscularly. The cows in PG group recieved 500 μg-1 PGF two times with an interval of 14 days and 10.5 μg-1 GnRH intramuscularly 48 h after the second PGF injection. Artificial inseminations were applied to the cows in both of the groups between 16-20 h after the GnRH injections. The pregnancy diagnosis was performed 30 days after the artificial inseminations by ultrasonography. The pregnancy rates were determined as 35.7% (15/42) in Ovsynch group and 47.6% (20/42) in PG group. Although, the pregnancy rate were higher in PG group than the Ovsynch group the differrence was not statistically important (p>0.05). It was concluded that the programme consisted of 14 days interval double dose PGF injections, GnRH applications 48 h following the second PGF injection and timed artificial insemination 16-20 h after the GnRH injection could be an alternative to the Ovsynch programme in timed artificial inseminations.

How to cite this article:

Gokhan Dogruer, Mustafa Kemal Saribay, Fikret Karaca and Yasar Ergun, 2010. The Comparison of the Pregnancy Rates Obtained after the Ovsynch and Double Dose PGF + GnRH Applications in Lactating Dairy Cows. Journal of Animal and Veterinary Advances, 9: 809-813.

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