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Effects of massive doses of ergocalciferol plus cholesterol on pregnant rats and their offspring.

Ergocalciferol (320,000 or 480,000 IU/kg) plus cholesterol (60 mg/kg) in olive oil solution was administered daily on 1, 2, or 4 consecutive days to pregnant rats from 9,10, 14, or 18 of gestation. The control animals received only olive oil. Disseminated lesions of metastic calcinosis were found in various tissues, in the coronary arteries and myocardium, in the media of the abnormal aorta, in the lung and pleura, in the gastoinstestinal tract, and in the kidney. This is in contrast to the atherosclerosis described in nonpregnant rats fed a similiar diet. A significant decline in maternal weight as well as a high rate of morbidity and mortality was observed. In mothers killed on day 22 of pregnancy, fetal and placental growths appeared significantly retarded suggesting a direct effect of the steroid or its more active metabolite, 1,25-dihydroxycholecalciferol, on the fetus or the trophoblastic tissue. Fetal bone lesionsassociated with a generalized retardation of ossification, placental edema, or calcification accompanied by a loss of the normal structure of the placenta and degenerative manifestation at this level were observed. Moreover, we noted a striking alteration of the fetal face in 33-39% of experimental fetuses, called by us carnival fetuses.