Livestock Studies
2022, Vol 62, Num, 2 (Pages: 074-080)
The Effects of GnRH and hCG Administration on Pregnancy Rate in Postpartum Dairy Cows
Emre Karsavuranoğlu 1 ,Mustafa Kemal Sarıbay 1 ,Ece Koldaş Ürer 1
1 Hatay Mustafa Kemal University, Faculty of Veterinary Medicine, Department of Obstetrics and Gynaecology, 31060, Hatay, Türkiye
DOI :
10.46897/livestockstudies.1173020
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This study was designed to determine the effects of GnRH administration alone at the
time of artificial insemination (AI) or in combination with hCG 5 days after GnRH injection
on conception rates in postpartum dairy cows. Cows in estrus, without any reproductive
health problem, between days 70-120 postpartum were randomly assigned to 3 equal
groups. Buserelin acetate (10 μg), was administered at the time of AI to Group I (n=40).
Group II (n=40) was administered first with Buserelin acetate (10 μg) at the time of AI
and then with 1500 IU of hCG on the 5th day after insemination. Group III was
maintained for control purposes and did not receive any treatment. Pregnancy diagnosis
was performed on day 30 post-AI by transrectal ultrasonography. Conception rates were
80% (32/40), 80% (32/40), and 57.5% (23/40) in Group I, II and III (P<0.05) respectively
In conclusion, it was determined that the use of GnRH alone at the time of AI or
additionally the use of hCG on the 5th day after AI increased the pregnancy rates in dairy
cows between 70-120 days postpartum, however, there was no difference in pregnancy
rates between these two treatments.
Keywords :
Cow Hormonal administration Pregnancy rate Postpartum