Abstract
SUMMARY Absolute and relative adrenal weight, blood plasma concentrations of 17-hydroxycorticosteroids and their production in vitro on incubation of adrenal slices with corticotrophin (ACTH), were measured in foetal pigs, piglets and older pigs. These criteria all indicated that adrenocortical activity was highest on the day of birth. It developed intensely in about the last 10 days of intra-uterine life. After birth it decreased progressively with age, approaching the adult level after weaning in the second month of life. The adrenal cortex of pigs of all developmental stages investigated in this study was capable of responding markedly to stimulation with ACTH. No significant differences in adrenocortical activity were found between sexes up to 90 days of age.
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