The Circadian Rhythm of Thermoregulation in Japanese Quail: III. Effects of Melatonin Administration

Recent studies indicate that the circadian pacemakers in the eyes of Japanese quail are coupled to the rest of the circadian system by both neural and hormonal outputs. The effects of exogenous melatonin administration on cir cadian body temperature and activity rhythms of quail were tested to deter...

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Veröffentlicht in:Journal of biological rhythms 1995-12, Vol.10 (4), p.284-298
Hauptverfasser: Underwood, Herbert, Edmonds, Kent
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container_title Journal of biological rhythms
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creator Underwood, Herbert
Edmonds, Kent
description Recent studies indicate that the circadian pacemakers in the eyes of Japanese quail are coupled to the rest of the circadian system by both neural and hormonal outputs. The effects of exogenous melatonin administration on cir cadian body temperature and activity rhythms of quail were tested to determine whether melatonin could be the hormonal link involved. Continuous melatonin administration caused arrhythmicity or period changes in the body temperature and activity rhythms of pinealectomized and sham-pinealectomized birds held in constant darkness and also significantly decreased the amplitude of the body temperature rhythms of normal birds held on light:dark 12:12. Further, mela tonin entrained the body temperature and activity rhythms of normal birds when administered daily via the drinking water. The results show that melatonin can affect the circadian system of quail and support the hypothesis that melatonin is importantly involved in linking pacemakers in the eyes to the rest of the circadian system.
doi_str_mv 10.1177/074873049501000402
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subjects Animals
Biological clocks
Birds
Body temperature
Body Temperature Regulation - drug effects
Body Temperature Regulation - physiology
Circadian rhythm
Circadian Rhythm - drug effects
Circadian Rhythm - physiology
Circadian rhythms
Coturnix - physiology
Coturnix japonica
Darkness
Drinking water
Female
Melatonin
Melatonin - administration & dosage
Melatonin - pharmacology
Pacemakers
Photoperiod
Pineal Gland - surgery
Surgical implants
Temperature effects
Thermoregulation
Wildfowl
title The Circadian Rhythm of Thermoregulation in Japanese Quail: III. Effects of Melatonin Administration
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