Vol. 12, Special Issue 9 (2023)

Author(s):
Mohammed Salman, K Ramchandra Reddy, K Venkataramana, G Aruna Kumari, B Swathi, Nidhishree J Jakkali and Mohammed Shaz Murtuza

Abstract:
The present work was conducted to evaluate estrus character in cows subjected to different estrus synchronization protocol.Estrus synchronization can play important role in faster multiplication of superior germplasm to ensure conservation of cattle breeds and increase in milk production. About 52 cows were distributed into 3 groups randomly. Group 1 (Ovsynch, n=15) 10µg GnRH on 0^th day, PGF₂α (500 µg) on 7^th day and second GnRH dose on 9^th day. Group 2 (CIDR group, n=10) 0^th day CIDR, removal of CIDR and 500 µg of PGF₂α at 7^th day. Group 3 (control, n=27) cows in natural estrus were included in this group. The results showed significant difference (p<0.05) in estrus response rate (%) between treated groups (Ovsynch (86.66), CIDR (100.00) and control group (55.55). The duration of onset of estrus (hrs.) has no significant (p>0.05) difference between Ovsynch (53.69±1.90) and CIDR (49.1±0.48) group, but both CIDR and Ovsynch group differed significantly (p<0.05) with control group (109.73±18.74). There was significant difference observed (p<0.05) in mean estrus intensity score between CIDR (16.30±1.59) and control group (11.07±1.05), but CIDR and Ovsynch group (13.38±0.94) has no difference significantly (p>0.05). From the present study it was concluded that among all treated group, CIDR protocol was most effective and efficient synchronization protocol for improving the efficacy of synchronization and conception rates in embryo transfer programme.