Delayed Nidation in the Rat Induced by Progesterone.

摘要: SummaryNidation of embryos was delayed from 1 to 45 days in rats ovariectomized on the 3rd day after mating, by subcutaneous injection 4 mg progesterone per day. Implantation until such time as μg estrone given addition progesterone. Recovery blastocysts one horn uterus during treatment and subsequent implantation other induced progesterone-estrogen indicates that are maintained a viable, but resting condition treatment. If were untreated for 8 days, nidation not observed when estrogen initiated 9th next 5 12 days. Rats 4th mating variable their response progesterone, some exhibited delay others implanted at normal time. Delayed up least 3 obtained hypophysectomized ...