Dhindsa D S, Metcalfe J, Resko J A
J Reprod Fertil. 1981 May;62(1):99-103. doi: 10.1530/jrf.0.0620099.
Concentrations of oestradiol-17 beta, oestradiol-17 alpha, 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 alpha 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.
怀孕矮山羊（山羊属）全身血浆中雌二醇 - 17β、雌二醇 - 17α和雌酮的浓度在大约第60天之前一直较低，然后在第120 - 140天（分娩日为140 - 145天）升至最大值。雌二醇 - 17α是主要的雌激素。在第100 - 130天，怀有3个胎儿的母羊体内这三种雌激素的含量均高于只怀有1个胎儿的母羊，但在第70 - 90天，只有雌酮值较高。研究表明，胎儿 - 胎盘单位是山羊妊娠期雌激素的来源。
