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Oestrogen concentrations in systemic plasma of pregnant pygmy goats

Summary. Concentrations of oestradiol-17β, oestradiol-17, and oestrone in systemic plasma of pregnant pygmy goats (Capra hircus) remained low until about Day 60 and then rose to maximum values at Days 120–140 (parturition Day 140–145). Oestradiol-17 was the predominant oestrogen. All 3 oestrogens at Days 100–130 were higher in females carrying 3 fetuses than in those carrying only one, but at Days 70–90 only oestrone values were higher. It is suggested that the feto-placental unit is the source of oestrogens during gestation in goats.