Abstract
Summary
Hypophysectomy in the newborn dog results in a prompt fall in the secretory rate of cortisol during collection of adrenal effluent blood. Due to the rapid rate of clearance of ACTH, lowest secretory rates were expected at 2–5 hr after hypophysectomy but, at 16–20 hr, an even lower rate was found. This unexplained observation was significant. The procedure of hypophysectomy recommends itself as a valuable means of exploring the endocrinologic status of the newborn.
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