The Effects of GnRH and hCG Administration on Pregnancy Rate in Postpartum Dairy Cows

Authors : Emre KARSAVURANOĞLU, Mustafa Kemal SARIBAY, Ece KOLDAŞ ÜRER

Pages : 74-80

Doi:10.46897/livestockstudies.1173020

View : 36 | Download : 14

Publication Date : 2022-12-29

Article Type : Research Paper

Abstract :This study was designed to determine the effects of GnRH administration alone at the time of artificial insemination insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(10 µg);, was administered at the time of AI to Group I insert ignore into journalissuearticles values(n=40);. Group II insert ignore into journalissuearticles values(n=40); was administered first with Buserelin acetate insert ignore into journalissuearticles values(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% insert ignore into journalissuearticles values(32/40);, 80% insert ignore into journalissuearticles values(32/40);, and 57.5% insert ignore into journalissuearticles values(23/40); in Group I, II and III insert ignore into journalissuearticles values(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

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