Vol. 11, Special Issue 8 (2022)

Author(s):
T Jeswanth Reddy, N Venkata Krishna, J Nikhil Kumar Tej and B Eswara Rao

Abstract:
Anoestrus and repeat breeding syndrome are the most important causes of poor reproductive performance in cattle. The current study was undertaken to find out the efficacy of Ovsynch protocol in terms of oestrus induction, time required for onset of induced oestrus, duration of induced oestrus and conception rate in postpartum anoestrous and repeat breeding in Ongole (Bos indicus) and Cross bred (Bos taurus) cattle. Total 35 cows with good body condition score (BCS >2.5), parity of two or above, healthy reproductive organs having history of anoestrus problems and repeat breeding syndrome were selected and divided into two groups. Cows in both groups received Ovsynch protocol with GnRH (10 µg) (GnRH-7d-PGF2α-48h-GnRH-18-24hAI). Oestrus detection and intensity of oestrus was done by visual observation and per rectal examination. The time required for onset of induced oestrus and duration of induced oestrus in the cows administered Ovsynch protocol was 54.13 ± 0.97; 22.94 ± 0.87 and 52.58 ± 1.04; 21.26 ± 0.81, respectively in postpartum anoestrum and repeat breeding cows. Among 35 treated animals, 80% (28/35) pregnancy was achieved and another 29 had become cyclic with success rate of treatment was 82.8%. The time required for onset of oestrus (hrs), duration of oestrus (hrs), oestrous response (%), conception in first AI (%), and overall conception (%) were similar (p>0.05) between the two disorders (anoestrum vs. repeat breeding). Further, the Ovsynch protocol produced similar results between the breeds (Ongole vs. HF crossbreds).