Abstract
Summary
Pregnancy has been maintained in rats hypophysectomized on day 6 of their first pregnancy and injected daily subcutaneously for 6 days with placentae from rats, 12 days pregnant. Five placentae or approximately 275 mg daily accomplished this in the majority of the test rats. One 12-day placenta plus 0.5 μg of estrone proved equally efficacious. Pregnancy was not maintained by similar treatment if the rats were also oöphorectomized.
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