R: Melatonina?
https://www.eurekalert.org/pub_releases/2017-03/uob-sdh030617.php
Citando:
"A new study, conducted at the University of Bristol, has identified how animals measure annual time to control seasonal fertility.
In birds and mammals, this process of adaptation is mediated by the release of hormones from the pituitary gland that control multiple functions such as reproduction, the response to stress, and when the animals grow a new coat. The measurement of day length, however, and consequently time of year, is mediated by the hormone melatonin, which is released from the pineal gland during the night. Until now, how melatonin could signal to the pituitary was not understood and has been the subject of a 30-year quest."
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