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Plasma β-endorphin and LH during prolonged hypoglycaemia in ewes

Published online by Cambridge University Press:  24 November 2017

A.M.X. Eloy
Affiliation:
Department of Animal Physiology and Nutrition University of Leeds, Leeds LS2 9JT
R.G. Rodway
Affiliation:
Department of Animal Physiology and Nutrition University of Leeds, Leeds LS2 9JT
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Extract

Normal reproductive function in female animals can be drastically impaired by a variety of stressful stimuli. For example, undernutrition and hypoglycaemia in sheep have been shown to suppress pulsatile LH secretion and to reduce the number of ewes showing pre-ovulatory LH peaks (Crump and Rodway 1986, Clarke et al. 1990). Similar stresses are also known to cause release of the opioid peptide β-endorphin into the circulation. Opioids are well-known to have a central inhibitory effect on LH release, although whether the elevated plasma concentrations of these peptides have any effect on LH secretion is unclear. The present study investigated the affect of insulin-induced hypoglycaemia on plasma concentrations of β-endorphin and LH.

Type
Reproduction
Copyright
Copyright © The British Society of Animal Production 1993

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References

Clarke, I.J., Horton, R.J.E. & Doughton, B.W. Investigation of the mechanism by which insulin-induced hypoglycaemia decreases luteinizing hormone secretion in ovariectomized ewes. Endocrinology 127: 14701476, 1990.CrossRefGoogle ScholarPubMed
Crump, A.D. & Rodway, R.G. Hypoglycaemia and LH release in the ewe. Proceedings Nutrition Society 45, 100A, 1986.Google Scholar
Leshin, L.S. & Malven, P.V. Bacteremia-induced changes in pituitary hormone release and effect of naloxone. American Journal Physiology 247: E585, 1984.Google ScholarPubMed
Malven, P.V. Searching for an inhibitory action of blood borne β-endorphin on LHG release. Journal of Reproduction and Fertility (Suppl) 34: 9. 1987.Google Scholar
Merriam, G.R. & Wachter, K.W. Algorithms for the study of episodic hormone secretion. American Journal of Physiology: 243: E310318, 1982.Google Scholar
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