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  • Title: Luteinizing and ovulatory action of oestradiol in the pregnant rat.
    Author: Roos J, Hassani M, Roos M.
    Journal: Cell Tissue Res; 1975 Aug 25; 161(3):317-28. PubMed ID: 1236773.
    Abstract:
    Oestradiol injection on Day 10 of pregnancy in rats, resulted in either ovulation or luteinization in 50% of cases on Day 12. Cytological data showed that the number of pituitary LH cells decreased significantly on Day 11 in all oestradiol-treated animals whether responsive or not to oestrogen by ovarian modifications, while the number of pituitary FSH cells only decreased significantly in females with characteristic ovarian signs of preovulation. Bioassay of pituitary FSH confirmed the cytological data. It is concluded that ovulation and luteinization only occurred in the pregnant rat when oestradiol triggered off a synchronous release of LH and FSH.
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