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Circadian clock determines the timing of rooster crowing

Authors
Journal
Current Biology
0960-9822
Publisher
Elsevier
Publication Date
Volume
23
Issue
6
Identifiers
DOI: 10.1016/j.cub.2013.02.015
Disciplines
  • Biology

Abstract

Summary Crowing of roosters is described by onomatopoetic terms such as ‘cock-a-doodle-doo’ (English), ‘ki-ke-ri-ki’ (German), and ‘ko-ke-kok-koh’ (Japanese). Rooster crowing is a symbol of the break of dawn in many countries. Indeed, crowing is frequently observed in the morning [1]. However, people also notice that crowing is sometimes observed at other times of day. Therefore, it is yet unclear whether crowing is under the control of an internal biological clock, or is simply caused by external stimuli. Here we show that predawn crowing is under the control of a circadian clock. Although external stimuli such as light and crowing by other individuals also induce roosters’ crowing, the magnitude of this induction is also regulated by a circadian clock.

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