Comparison of conception rate following GnRH and hCG based synchronization protocols in functionally infertile cows

Efficacy of different estrus synchronization protocols in repeat breeder cows

“…Delayed ovulation, anovulation and luteal insufficiency can lead to functional infertility in dairy cows which are characterized by abnormal follicular development and abnormal estrous cycle (Parmar 2015). These conditions result in mismatching of the time of ovulation and artificial insemination (AI) followed by lower conception rate, early embryonic mortality, and repeat breeder syndrome (Kashyap et al 2018). Size of the dominant follicle also has an important role in maintaining luteal function and subsequent embryonic survival (Vasconcelos et al 2013).…”

“…These cows were divided into four treatment and one control groups. Ovsynch (n=73) and Ovcosynch (n=23) synchronization protocols were applied according to Kashyap et al (2018) whereas Doublesynch (n=36) and Heatsynch (n=47) were applied as per Kapse et al (2017). A control group consisted of 93 cows which were not given any treatment and AI was done on the day of observed estrus after the examination of clear cervicovaginal discharge.…”