Induction of ovulation in the pregnant rat with luteinizing hormone-releasing hormone (LRH). 
Injection of luteinizing hormone-releasing hormone (LRH) induced ovulation in the pregnant rat on days 4 through 22.  Only rats autopsied on days 2 and 3 failed to ovulate.  Reduced responsiveness occurred between days 12 and 19; the least sensitive day was 16.  Based on the number of ova recovered, day 21 was the most sensitive to LRH stimulation.