Effects of a single injection of gonadotropins on the ovarian function in late pregnancy in rats
Hashizume, K.; Umezu, M.; Masaki, J.
Japanese Journal of Animal Reproduction 24(3): 116-120
Wistar rats were given a single subcutaneous injection of 1 or 10 mu g LHRH on day 17, 18 or 19 of pregnancy, or 10, 20 or 50 IU PMSG on day 18 or 19 of pregnancy, or 20 IU HCG on day 19, 20 or 21 of pregnancy; 10 mu g LHRH prolonged pregnancy, whereas 10, 20 and 50 IU PMSG or 20 IU HCG caused premature delivery. 10 mu g LHRH or 20 IU HCG did not affect the number of ova shed or ovarian weight after parturition, whereas 50 IU PMSG increased both. None of the gonadotropins affected the interval between parturition and 1st postpartum ovulation.