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Discussion

Abstract

Question: Hansel

I would like to ask both speakers the same question, and I hope we get the same answer. I noticed both of you carefully avoided saying that oxytocin does not cause prolactin release. Is it possible that Benson and Folley and others were right after all? What is the effect, do you know?

Grosvenor: I had planned to discuss this during my talk but omitted it because of time. The evidence is still ambiguous, at least, in the rat. As you recall, the first indication that oxytocin might be a neural humoral mediator of prolactin release was based upon studies in which oxytocin was found to mimiek the ability of prolactin to prolong or retard the normal rate of involution of the rat mammary gland, a function which is also shared by hydrocortisone. Shortly after this, Hahn and Sawyer injected some prolactin into the teat duct of the rabbit and found that some milk secretion resulted.