Effect of multiple insulin injections on estrus expression in cross bred cows

Abstract

The present study was conducted on 12 cross bred cows divided into two groups (n=6 each with 6) Group I and Group II. Both groups on day 10 post estrum received an injection of PGF2α. In addition group I received insulin @ 0.25 IU/Kg B.Wt, SC every 24 hours until estrus expression while cows in group II received every 12 hours on the day of induced estrus (at 0 hr, 12 hr and 24 hr). The results showed a 100% estrus induction rate in both groups. The mean time taken for estrus induction was 71.00 ± 4.97 hrs in Group I and 65.33 ± 5.17 hrs in Group II, with no statistically significant difference between the groups (P > .05). The duration of estrus was found to be 25 ± 0.85 hrs in Group I and 23.83 ± 1.32 hrs in Group II (P > 0.05). The mean estrus intensity score was 16.16 ± 1.10 in group I and 14.00 ± 1.18 in group II, respectively (P > .05). Among the total number of cows in the present study, most of the cows expressed intense (58.33%) to normal estrus (41.66%). A higher proportion of cows exhibited intense estrus (66.66%) in group I compared to group II (50.00%). The present study could be concluded that the administration of multiple insulin injections have a positive impact on parameters of estrus expression. However, the influence may be subtle or variable and influenced by a range of factors.