Oestrogen concentrations in systemic plasma of pregnant pygmy goats

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Abstract
Concentrations of estradiol-17.beta., estradiol-17.alpha. and estrone in systemic plasma of pregnant pygmy goats (C. hircus) remained low until day 60 and then rose to maximum values at days 120-140 (parturition day 140-145). Estradiol-17.alpha. was the predominant estrogen. All 3 estrogens at days 100-130 were higher in females carrying 3 fetuses than in those carrying only one, but at days 70-90, only estrone values were higher. The feto-placental unit apparently is the source of estrogens during gestation in goats.