Agonists of endogenous opioid peptides suppress LH, and stimulate cortisol and growth hormone during the follicular phase in heifers.

Abstract

We evaluated the effects of [D-Ala2,Me,Phe4,Met(0)ol]-enkephalin (FK 33-824) and morphine, opioid receptor agonists, on concentrations of LH, cortisol and GH during the follicular phase in heifers. During three trials, oestrous cycles of Angus heifers were synchronized by two injections of prostaglandin F2 alpha (PGF2 alpha) resulting in 17 induced… (More)

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@article{Armstrong1989AgonistsOE, title={Agonists of endogenous opioid peptides suppress LH, and stimulate cortisol and growth hormone during the follicular phase in heifers.}, author={John David Armstrong and Barbara Johnson}, journal={The Journal of endocrinology}, year={1989}, volume={121 1}, pages={11-7} }