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  • Title: Chorionic surface area in conceptuses from sows treated with progesterone and oestrogen during early pregnancy.
    Author: McGovern PT, Morcom CB, de Sa WF, Dukelow WR.
    Journal: J Reprod Fertil; 1981 Mar; 61(2):439-42. PubMed ID: 7205790.
    Abstract:
    Treatment of sows with 25 mg progesterone and 12.5 microgram oestrone daily between 14 and 23 days of gestation resulted in an increase of 15% of chorionic surface area and an increase in volume of allantoic fluid when examined at 30-35 days of gestation. In contrast, there were no significant differences in chorionic surface area or allantoic fluid volume between treated and control sows examined at 46-50 days of gestation. This suggests that progesterone-oestrone treatment of the sows during early pregnancy has only a short-lived effect on development of the allantochorion.
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