本文旨在证明单独或序贯使用17β-雌二醇和孕酮是否能逆转不同剂量的黄体生成素释放激素(LRH)对着床的延迟和抑制作用。作者用200～210克体重的雌性大鼠进行实验,与雄鼠合笼后,以阴道涂片中出现精子作为妊娠的第一天。从妊娠第1～7天,每日每鼠给LRH总量100或500微克,分两次给药。动物分为几组,实验组于给LRH同时给予不同的甾体激素,即:1组从妊娠第1～4天,每日每鼠给17β-雌二醇0.05 This article aims to demonstrate whether the use of 17β-estradiol and progesterone, alone or sequentially, can reverse the delayed and inhibitory effects of different doses of luteinizing hormone-releasing hormone (LRH) on implantation. The authors used 200 ~ 210 g body weight female rats to experiment, caged with male rats, vaginal smear sperm as the first day of pregnancy. From day 1 to day 7 of gestation, rats were administered a total of 100 or 500 micrograms of LRH daily in two doses. The animals were divided into several groups, the experimental group given to the LRH at the same time different steroid hormones, namely: 1 group from the first to fourth days of gestation, 17β-estradiol 0.05