Abstract

The study was conducted to determine the efficacy of CIDR protocol with fixed time insemination in crossbred dairy cows. Out of 283, group 1 calved animals (n = 164) and heifers animals (n = 119) were inserted with CIDR for 7 days, on 8 th day of CIDR inserted animals injected 2 ml of PGF2x i/m to all these animals followed by removal of CIDR on 9 th day and fixed time AI at 48 and 72 hours after CIDR devise removal. The Oestrus expression rate was higher in heifers groups (65.14%) than calved animals (34.86%). Pregnancy rates for first service following of estrus were 104 (63.41%) and 77 (64.00%) in calved animals and heifer respectively. The over all conception rate for first service following of oestrus was 181 (63.71%). Pregnancy rate for subsequent service were 26 (43.33%) and 18 (42.86%) in calved animals and heifers respectively. The over all conception rate for subsequent service was 45 (44.28%). Over all conception rate after 2 oestrus cycle period programme was 225 (79.51%). Conception rate between first and second services were 63.71% and 43.10%. There is significant difference between first service and second service were noticed.

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