Description

A study was conducted to test the hypothesis that synchronizing the follicular wave emergence by hormonal and non hormonal methods and delaying the exposure of follicles to LH would increase the ovulation rate and embryo recovery in Bos indicus cattle. A total of 94.83% cows responded to superovulation treatment without any significant difference between groups. Compact morula comprised the highest number (63.22 79.41%) in all the treatment groups. Overall data revealed that 25.45%, 40.00% & 34.54% of cows flushed were poor, average and good embryo donors respectively. As the CL number increased, the mean number of total ova/embryos increased progressively and significantly within the groups consequent to increase in ovulation number from 2-10 and 10 respectively. The number of calving had no significant (P0.05) effect on superovulatory responses. Pregnancy rate with transfer of fresh embryos (52.94%) was significantly influenced by transfer site and transfer quality. The ovulation rate and embryo recovery were negatively correlated to concentrations of P4 on day 0 but positively correlated to concentrations of P4 on day 3 and day 7/8.