ABSTRACT
This study aimed to determine the success of pregnancy and the condition of the ovaries in Artificially Inseminated (AI) cows using single and double dosages of Friesian Holstein Crossbred cows. In this study, 100 Friesian Holstein crossbred cows were treated with single and double dosages of AI. The method was experimental, while the treatments used a single dosage at the 8th hour and double dosages at the 2nd and 8th hours after the onset of estrous. The parameters observed were non-return rate-1 (NRR1), non-return rate-2 (NRR2), conception rate, and pregnancy rate. The results showed that the values of NRR1, NRR2, CR, and PR in the single-dosage treatment were 84%, 64%, 48, and 52%, while in the double-dosage treatment, were 80%, 56%, 40, 82%, and 46.82%, respectively. In addition, the cows that experienced pregnancy failure in a single dosage treatment were normal ovaries 21 (87.5%), persistent corpus luteum 2 (8.33%), and ovarian hypofunction 1 (4.1%). While in the double dosage treatment, normal ovaries were 22 (88%), persistent corpus luteum 1 (4%), and ovarian hypofunction 2 (8%). This study concludes that pregnancy success is higher in single-dosage AI than in double-dosages. In addition, ovarian disorders do not cause pregnancy failure.
