Seasonal rhythm in the hypothalamo-hypophyseal-adrenal function of the chicken.
PMID 200066 · Acta physiologica Academiae Scientiarum Hungaricae · 1976
Authors: Z Majsa; P Péczely
Abstract
The seasonal rhythm in hypothalamo-hypophyseal-adrenal function was studied in 3-week-old, meat-hybrid chickens, bred under standard conditions, CRF content in the median eminence and ACTH content in the adenohypophysis showed the maximum in February, the minimum in August, to return practically to the February level by November. Adrenal corticosterone production was maximum in February decreased by May and stayed at the low level for the further months of the year. The increase in autumn of the CRF content in the median eminence and of the ACTH content in the adenohypophysis, with unaltered corticosterone production suggests a reduced functioning of the mechanisms regulating hypothalamic release. It is assumed that the winter maximum in the activity of the corticotropic system is due to the endogenous annual rhythm.
Adrenocorticotropic Hormone; Animals; Chickens; Corticosterone; Corticotropin-Releasing Hormone; Hypothalamo-Hypophyseal System; In Vitro Techniques; Pituitary-Adrenal System; Seasons
Cite
Z Majsa; P Péczely. Seasonal rhythm in the hypothalamo-hypophyseal-adrenal function of the chicken. Acta physiologica Academiae Scientiarum Hungaricae (1976). PMID 200066.