Effects of ovariectomy, gonadal steroid replacement and photoperiod on plasma β-endorphin in the ewe

Autor:	S. Al-Gahtani, R. G. Rodway, D. P. Fordham, L. A. Durotoye
Rok vydání:	1994
Předmět:	photoperiodism endocrine system medicine.medical_specialty Equine Chemistry medicine.medical_treatment Steroid Endocrinology Food Animals Internal medicine medicine Animal Science and Zoology Secretion Small Animals Ovarian steroid hormones hormone substitutes and hormone antagonists
Zdroj:	Theriogenology. 41:1509-1521
ISSN:	0093-691X
DOI:	10.1016/0093-691x(94)90202-t
Popis:	The effects of gonadectomy, photoperiod and ovarian steroid replacement on plasma beta-endorphin concentrations were studied in 2 experiments using mature ewes. In Experiment 1 ovariectomy resulted in an increased plasma beta-endorphin concentration. Changing the photoperiod from long to short daylength had little effect on beta-endorphin, but transfer from short to long photoperiod caused a fall in the beta-endorphin level. In Experiment 2 ovariectomy again caused an increase in plasma beta-endorphin. Treatment with progesterone, estradiol or a combination of both failed to reduce the level to preovariectomy values, although LH concentrations were reduced. No diurnal rhythmicity in beta-endorphin secretion was observed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::946db7b7c6a3288fb63b0cff648f5f44 https://doi.org/10.1016/0093-691x(94)90202-t Zobrazit plný text záznamu