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These studies suggest that the sound of a rooster crowing is influenced by the circadian clock, external stimuli like light and other roosters' crowing, and estradiol during embryonic development.
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The sound of a rooster crowing is a well-known symbol of dawn across various cultures. This vocal behavior, typically associated with male domestic fowls, has intrigued researchers who aim to understand the underlying causes and mechanisms. Two primary factors have been identified: the internal biological clock and hormonal influences during embryonic development.
Circadian Clock Regulation:
Hormonal Influence During Embryonic Development:
The crowing of roosters is influenced by both an internal circadian clock and hormonal factors during embryonic development. The circadian clock primarily determines the timing of crowing, while estrogens during embryonic development affect the incidence and acoustic properties of the crowing behavior. Together, these factors provide a comprehensive understanding of what causes the sound of a rooster crowing.
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