Comparing Response of Estrus Synchronization in the Heifers and Cows on Estrus Initial, Duration of Estrus and Pregnancy Rate Bali Cattle

The objective of this study was to evaluate on the estrus initial, duration of estrus and pregnancy rate following of prostaglandin F2 alpha injection in heifers and cows. A total of 60 Bali cows were divided into two group, first group was contain 30 heifers and second group comprise 30 cows. The weight of cows were 300±6.87 and 365±8.14kg, aged approximately 2 years and 3-6 years for heifers and cows, respectively. All the heifers and cows were normal cycling with showing regular cyclic activities and having active of corpus luteum. The parameters in this study was determine including the time required for onset of estrus,duration of estrus and pregnancy rate. The result showed that percentage estrus response, duration of estrus and pregnancy rate were non significant difference (P>0.05) between heifers and bali cows after estrus synchronization with single dose of prostaglandin F2α. It was concluded that injection of PGF2α on heifers and bali cows was similar result on the time required for onset of estrus, duration of estrus and pregnancy rate.