Vol. 9, Special Issue 6, Part C (2024)

Author(s): Chandra Prasad B, Venkata Naidu G, Srinivas M, Ragunath M and Ashwini Kumar

Abstract: The present research was carried out to evaluate the preovulatory follicle size, corpus luteum diameter and subsequent pregnancy rate in postpartum sub-estrus and true anoestrous in high yielding lactating graded Murrah buffaloes (Bubalus bubalis) using estrus and ovulation hormonal protocols viz. Double PGF2α (DPG), Presynch-Ovsynch (POVS), Ovsynch (OVS) and CIDR Ovsynch (COVS) and their influence on fertility in farm and field during breeding and low breeding season. Pre ovulatory follicle (POF) diameter (mm) observed at the time of AI in DPG, POVS, OVS, COVS and control group buffaloes were 12.86, 14.15, 13.16, 11.58, 11.15 and 11.45, 12.47, 11.75, 10.11, 10.15 in pregnant and non-pregnant buffaloes, respectively under farm conditions and 12.44, 14.21, 13.05, 11.32 and 11.65; 11.22, 11.31, 10.92, 9.49 and 9.35 in pregnant and non-pregnant buffaloes, respectively under field conditions. The mean diameter (mm) of the corpus luteum (CL) was recorded on day 10 post AI. The per cent conception rate at induced/observed estrus were 39.13, 42.85, 41.66, 28.57 and 25.00 in DPG, POVS, OVS, COVS and control group, respectively under farm conditions.