PMID: 6539358Jun 1, 1984Paper

Developmental changes in the diurnal rhythm of secretion of corticosterone and LH in the domestic hen

The Journal of Endocrinology
S C WilsonF J Cunningham

Abstract

When diurnal changes in the plasma concentrations of corticosterone and LH were compared at various times during sexual development a diurnal rhythm in the secretion of corticosterone was most pronounced at 4.5 weeks of age in hens maintained on a schedule of 8 h light: 16 h darkness (8L: 16D) and at 8.5 weeks of age in hens maintained on 16L: 8D. At these ages the phase-angle of the rhythm in relation to the onset of darkness was 3 h earlier than had been observed in previous studies of the adult hen. The characteristics of the corticosterone rhythm changed during sexual development and diurnal changes were no longer evident in hens at 17 weeks of age at a time when prepubertal plasma concentrations of LH were maximal. However, there was a tendency for plasma concentrations of corticosterone to fluctuate diurnally in hens studied at less than 10 days before the onset of lay although not to the same extent as has previously been observed in the adult hen. This period of development was associated with a pronounced increase in the plasma concentration of progesterone. An increase in the plasma concentration of LH at the onset of darkness was observed at all ages in hens maintained on either photoschedule . In hens of 4.5-15 week...Continue Reading

Citations

Jan 20, 2007·Physiology & Behavior·Pierre MormèdeIsabelle Veissier
Dec 1, 1984·The Journal of Experimental Zoology·F J CunninghamR T Gladwell
Feb 1, 1987·Zentralblatt für Veterinärmedizin. Reihe A·S Kajal, R P Moudgal
Jan 25, 2018·Animal : an International Journal of Animal Bioscience·H LarsenJ-L Rault

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