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Immunoactivity concentrations of ovarian relaxin, serum relaxin and serum progesterone were determined from Day 12 through Day 18 of pregnancy in rats treated with oil or oestradiol-17 beta after hysterectomy or hypophysectomy and hysterectomy on Day 12. Relaxin and progesterone concentrations increased between Days 12 and 18 in sham-operated rats but failed to increase or declined in oil-treated hysterectomized or hypophysectomized-hysterectomized animals. Oestradiol treatment increased serum concentrations of relaxin and progesterone in hypophysectomized-hysterectomized rats on Day 15 and increased the concentrations of ovarian and serum relaxin and serum progesterone in hysterectomized rats on Day 18. These data are consistent with the concept that placental support for the promotion and maintenance of relaxin and progesterone concentrations from Day 12 through Day 18 may be mediated, at least in part, through a common mechanism(s) which involves oestradiol.

Effect of oestradiol-17 on ovarian and serum concentrations of relaxin during the second half of pregnancy in the rat