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Concentrations of progesterone, 17-hydroxyprogesterone and 20-dihydroprogesterone in the plasma of mares during pregnancy and at parturition

Summary. Plasma concentrations of progesterone and 17-hydroxyprogesterone were high in the 2nd and 3rd months of gestation, but 20-dihydroprogesterone increased from a level of 2 ng/ml, during the first 3 months, to 10–15 ng/ml during months 5–10, to reach 80–120 ng/ml during the last 30 days before foaling.