Plasma cortisol in 6 catheterized fetal pony foals ranged from 0.7 to 5.3 μg/100ml. In the 2 catheterized fetal foals (gestational age 318 and 321 days at birth) which were born alive, there was no rise in the immediate prenatal period. Plasma cortisol levels in the newborn foals of thoroughbred mares rose from 6.8 to 8.3 μg/100ml in the first hour of postnatal life and then fell slowly during the rest of the first day of life. These results are compared with findings in other species.
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