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The twinning rate of ewes is poorly related to plasma concentrations of gonadotropins. In this study, we tested an alternative hypothesis for the control of twinning rate, by testing whether nutritional treatment sufficient to affect twinning could alter estrogen metabolism, with a particular focus on the enterohepatic recirculation. Groups of 5(More)
Ovariectomized ewes were immunized against cortisol, oestrogen or progesterone to determine whether steroids of non-ovarian origin occur in sufficient amounts to influence the reproductive system. Ewes immunized against oestrogen (oestrone + oestradiol) had smaller uteri (P less than 0.05) and a lower concentration of oestradiol in uterine tissue (P less(More)
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