Pregnancy rate of Artificial Insemination in beef cows after estrous synchronization at different region

This study aimed to determine the pregnancy rate of artificial insemination (AI) in beef cows after estrous synchronization using prostaglandin (PGF2α). A total of 398 beef cows were used in the present study; 183 in Bantaeng (BT) region and 215 beef cows in Bulukumba (BK) region, respectively. Out of 398 beef cows, 201 were randomly subjected to estrous synchronization in both regions and inseminated after estrus was detected, and the remaining 197 beef cows were inseminated after natural estrus. The data were compared using the Chi- square test. The results of this study showed that the overall pregnancy rate with and without estrous synchronization was 52.8%; consisted of 58.7% and 46.7% of pregnancy rate with and without estrous synchronization, respectively. The pregnancy rate of AI in beef cows after synchronized the estrus in BT was significantly (P<0.05) lower than in BK (51.0% vs. 66.3%), but did not show significantly different for the pregnancy rate in beef cows without estrous synchronization. In the BK region, the pregnancy rate of the cows synchronized the estrus was significantly (P <0.05) higher than without estrous synchronization but did not in BT region. It can be concluded that there was a tendency that beef cows synchronized the estrus had a higher 12.0% pregnancy rate than without estrous synchronization.