Cows in the study were inseminated following estrous detection during July to October in two commercial dairy herds in Israel.
Results showed that treatment did not alter the overall conception rate. However, the probability of conception increased in CIDR-treated cows with low body condition score (BCS) compared with their control counterparts (53 vs. 27%, respectively). Furthermore, a pronounced increase in conception probability was recorded in CIDR-treated cows exhibiting both low BCS and postpartum reproductive disorders, compared with their control counterparts (58 vs. 14%, respectively).
Therefore, the scientists conclude progesterone supplementation can be effective, especially for cows with low BCS and postpartum reproductive disorders.