REPRODUTIVE PERFORMANCE OF BRAHMAN CROSS COWS ON DIFFERENCE TIME INTERVALS OF ARTIFICIAL INSEMINATIONMOHAMAD ERVANDI, M. NUR IHSAN, SRI WAHJUNINGSIH, AULIA PUSPITA ANUGRA YEKTI AND TRINIL SUSILAWATIAbstract The success of the Artificial Insemination (AI) is determined by the precise time of the artificial insemination influencing on the successful pregnancy of cow. This study aims to find out the reproductive performance on differences time intervals between the estrus signs and the artificial insemination of Brahman Cross Cows. The materials used were 40 heads cow. The samples were chosen through purposive sampling employing criteria: 2-3 years of age, 300-500 kg of weight, normal circle of estrous, and BCS ranges from 4 to 7 (in scale 1-9). The treatments of artificial insemination consist of 20 head with time interval 0-2 hours and 20 head others with time interval 8-10 hours as a control. The estrus synchronization was performed by using PGF2α hormone (labeled as Lutelayse), and as for the artificial insemination using Ongole Crossbred liquid semen was used with motility more than 40%. The observed parameters were the pregnancy rate using NRR method, service per conception and conception rate. The data was analyzed with descriptive-analytic approach. The result of the study showed that the success of the artificial insemination of the Brahman Cross with time interval 0-2 hours (NRR1 85%, NRR2 85%, NRR3 85%) was higher than that of with time interval 8-10 hours (NRR1 75%, NRR2 65%, NRR3 65%), but did not indicate a significant result in conception rate of the artificial insemination with time interval 0-2 hours (25%) which was higher than that of 8-10 hours (20%). The time interval difference of the artificial insemination of the Brahman Cross has the effect on the service per conception. |