Effect of modified ovsynch synchronization program combined with vitamin and mineral application on fertility in cows

Objective: In this thesis study, it was aimed to investigate the effects of using bolus containing vitamin A, β-carotene, selenium, manganese, zinc, copper, palm oil and chestnut extract as a feed additive on fertility in dairy cows undergoing modified ovsynch synchronization. With the obtained results, it is aimed that the vitamin and mineral supplements used will increase fertility. Material and Methods: The thesis material consists of 64 cows that had a healthy postpartum period after calving. Cows were randomly divided into 2 groups as bolus (Group I, n=32) and control (Group II, n=32). Cows that had a healthy postpartum period were included in Group I and vitamin mineral bolus was administered orally on the 50th postpartum day at the earliest. On the 7th day following the bolus application, modified ovsynch synchronization was applied to the animals included in Group II and Group I as an ovulation synchronization program. Gonadotropin-releasing hormone (GnRH) was applied on the zeroth day, prostaglandin F2α on the 7th and 8th days, GnRH on the 9th day, and artificial insemination was performed 16-24 hours later. Pregnancy diagnosis was made by transrectal ultrasonography on the 30th-35th days after the artificial insemination application and statistically examined. Results: Based on the data obtained, it was found that bolus application before artificial insemination caused a statistically significant increase. Conclusion: It was concluded that the vitamin mineral bolus applied in this study contributed to the business economy by increasing the pregnancy rate and fertility.