Comparative efficacy of different estrus synchronisation protocols in postpartum acyclic crossbred cows

Abstract

The present study is undertaken in 24 postpartum acyclic crossbred cows maintained under rural managemental conditions. The cows are randomly divided into three groups viz., Ovysynch, Ovysynch + PRID, PRID + PG and efficacy was recorded. The estrus response (per cent) is observed as 75.00, 100.00 and 87.50 with the mean duration of estrus (hours) as 50.62 ± 8.39, 68.00 ± 2.61 and 58.63 ± 9.36 for Group I, II and III, respectively. Intensity of estrus exhibited is higher in Group II (62.5%) followed by Group III (50.0%) & Group I (25.0%), respectively. The first service conception rate (per cent) is 50.00 in both Group I and III, whereas it is recorded lower in Group II (37.50). The overall conception rate (per cent) is highest in Group III (62.50) followed by Group I and Group II (50.00, each) with no significant difference (P>0.05). It is concluded that Ovysynch + PRID protocol resulted in better estrus exhibition, while PRID + PG protocol is effective in obtaining optimum conception rate with fixed time Artificial Insemination in postpartum acyclic cows.