Impact of Doublesynch and Ovsynch Protocols, Preovulatory Follicle, Estradiol and Luteal Profiles on Fertility in Cyclic Murrah Buffaloes during Breeding and Compromised-Breeding Season
DOI:
https://doi.org/10.48165/ijar.2022.43.1.9Keywords:
Conception rate, Murrah buffalo, Ovsynch, PGF2α, POFAbstract
The present study designed to evaluate the efficacy of Doublesynch and Ovsynch estrus synchronization protocols, preovulatory follicle (POF) and luteal profile in cyclic Murrah buffaloes (n=83) in summer and winter season at farm and field level. In Ovsynch protocol, buffaloes were administered (i.m.) two injections of 10µg, Buserelin acetate on days 0 and 9, and an injection of 500µg, Cloprostenol on day 7. In Doublesynch protocol, an additional injection (i.m.) of 500µg, Cloprostenol 2 days before the start of Ovsynch protocol was administered. The ultrasonography (USG) and blood sampling was performed on each day of treatment, on day of estrus and 10 days post-AI. The conception rate in Ovsynch treatment group during summer and winter season was 20% and 27.8%, respectively and in Doublesynch groups, it was 40% and 48% in summer and winter season, respectively. Overall mean diameter of POF on day of estrus was larger (p<0.05) in pregnant than non-pregnant buffalo (14.6 ± 0.4 vs 12.7 ± 0.3 mm, respectively). The POF diameter was positively correlated with estradiol concentration on the day of AI and corpus luteum (CL) diameter on day 10 post-AI (E2: r=0.84, p<0.05; CL: r=0.72, p<0.05). Doublesynch group’s buffaloes had higher (p<0.05) ovulation rate after first GnRH injection than Ovsynch group than Ovsynch in both season. It was concluded that Doublesynch protocol can be used as estrus synchronization protocol in both seasons to achieve acceptable conception rate with size of preovulatory follicle greatly affecting the fertility by influencing estradiol levels and luteal profile in buffalo.
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