Vol. 8, Issue 4, Part G (2023)

The present study was conducted to assess the influence of Body Condition Score (BCS) and serum progesterone concentration at the time of AI on intensity of estrus and conception rate in thirty anestrus crossbred cows following estrus induction. The cows were treated with progesterone intravaginal (CIDR) based estrus induction protocol with double fixed timed inseminations at 12 and 24 h after injection of last GnRH. BCS were recorded for the all the cows before estrus induction protocol. On the day of first AI, blood was collected from all the animals to estimate serum progesterone level. The overall conception rate in the present study was 30 % (9/30). The distribution of animals with BCS of 2.00, 2.25, 2.50, 2.75 and 3.00 were 6.67 %, 43.33%, 40%, 6.67% and 3.33% respectively. In the present study, there is trend that the intensity of estrus is increasing with increase in BCS. Though statistically non-significant, the conception rate was also found to increase with increase in BCS. The progesterone concentration at the time of induced estrus was found to be 0.59±0.00, 1.01±0.19 and 0.52±0.13 ng/ml in animals with weak, intermediate and intense estrum, respectively. The progesterone concentration at the time of estrus for pregnant cows (0.63±0.10 ng/ml) is significantly (p<0.05) lower when compared to non-pregnant cows (1.04±0.21 ng/ml). In conclusion, BCS positively associated with the intensity of induced estrus and serum progesterone level at the time of AI and pregnancy status is negatively correlated in anestrus cows following estrus induction.