Abstract
Corpora lutea in rats were isolated in vivo from the rest of the ovary by autotransplantation; they were put under the kidney capsule where they developed into ectopic corpora lutea. The remaining ovaries were removed on days 79 or 11 and pregnancies terminated in 16 out of 25 animals. Rats ovariectomized on days 13 or 14 and sham-operated rats remained pregnant. The presence of follicles is associated with survival of pregnancy suggesting that follicular steroids together with luteal steroids are necessary at these stages of pregnancy. All but 1 rat remained pregnant when treated with estradiol-17beta; injections of LH (luteinizing hormone) and /or prolactin were largely unsuccessful in maintaining pregnancies. Steroids produced by corpora lutea are necessary but not sufficient for the maintenance of pregnancy; steroids produced by nonluteal components of the ovary are vital for the success of pregnancy after implantation.
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