Ovulation synchronization for improving fertility in postpartum dairy cows

A Study was conducted to determine the synchronization response with Ovsynch+CIDR protocol in cows. Pre synchronization medicinal treatment was given to the cows before synchronization. Total 10 cows were synchronized with an intravaginal CIDR containing 558 mg of progesterone for 7 days, starting on day 0 at the time of first GnRh injection. Cows were injected with PGF₂α (Cloprostinol, 500 μg) IM, on day 7 and the CIDR were removed on day 7 and on day 9 second GnRh injection 2.5 ml I/M was injected. Fixed Time Artificial Insemination was done 16–24 hr after second GnRh injection. Estrous response was observed 100 per cent. The time required for onset of oestrous was 58.80 ±2.65 hrs., whereas the duration of oestrus observed was 23.80±0.55 hrs. The incidence of intense, intermediate and weak estrus was observed 40, 40 and 20 per cent, respectively and the first service conception rate was 40 per cent. The Ovsynch+CIDR protocol induces better estrus response and first service conception rate in post partum cows.