title: [Participation of sympathetic-adrenal system catecholamines in regulating the reproduction and molting of the hen].
abstract: Studies have been made of diurnal changes of adrenalin and noradrenalin content of the blood plasma in egg laying and molting hens. In laying hens at night time, as compared to daily period, the level of both catecholamines decreased, whereas that in molting ones--increased. In laying hens kept under illumination, catecholamine content did not undergo significant diurnal changes. Differences between laying and non-laying hens were absent during the daytime. In laying hens, noradrenalin content of the blood exhibited negative correlation with their egg productivity. Reduction of photoperiod from 14 to 6 h per day resulted in a sharp decrease of egg laying and the development of molting. Under these conditions, artificial increase of adrenalin content of the blood at night time (by means of repetitive injections) prevented the decrease in egg laying. Daily injection of this hormone did not produce this effect. Exogeneous adrenalin inhibited molting irrespectively of the time of its injection. Noradrenalin injections did not affect the molting rate and egg laying in hens. The data obtained reveal possible role of natural adrenalin in regulation of egg laying and molting in hens at night time.
mesh_terms: D000311:Adrenal Glands / Q000502:physiology*; D000818:Animals; D002395:Catecholamines / Q000502:physiology*; D002645:Chickens / Q000502:physiology*; D002940:Circadian Rhythm / Q000187:drug effects; D004837:Epinephrine / Q000097:blood / Q000494:pharmacology; D005241:Feathers / Q000187:drug effects / Q000502:physiology*; D005260:Female; D009638:Norepinephrine / Q000097:blood / Q000494:pharmacology; D010058:Oviposition / Q000187:drug effects; D012098:Reproduction / Q000187:drug effects; D013564:Sympathetic Nervous System / Q000502:physiology*
chemical_list: D002395:Catecholamines; D009638:Norepinephrine; D004837:Epinephrine
vernacular_title: Uchastie katekholaminov simpato-adrenalovoĭ sistemy v reguliatsii razmnozheniia i lin'ki kury.