Abstract
Abstract The effects of pinealectomy with or without substitutive administration of melatonin on the concentrations of epinephrine (E) and norepinephrine (NE) in the adrenals of young chicks were studied at mid‐day and mid‐night. The two‐week old chicks were either non‐operated (NO), or sham‐operated (SO), or pinealectomized (Px) and maintained in LD 12: 12 for 15 days. During this period, half of the total number of NO, SO, and Px chicks were injected daily in the afternoon with melatonin (Mel; 10 ug/100 g body wt) and the remaining birds from the same groups were administered daily only with the vehicle (V; ethanol‐saline) of the hormone. The control (Con) birds were maintained under natural conditions without any treatment. In the adrenals of both the Con and NO‐V birds, a significant nocturnal increase in the concentration of E was noted compared to the same at mid‐day. But the night‐time value of adrenal E was lowered in SO‐V birds and raised in SO‐Mel chicks. Exogenous melatonin in intact (NO‐Mel) a...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
