Serum concentrations of melatonin in prepubertal gilts exposed to either constant or stepwise biweekly alteration in scotophase

Melatonin (MEL), a hormone known to mediate photoperiodic cues, is secreted from the pineal gland in a circadian fashion in numerous species. The transduction of photoperiodic information into the secretion of MEL, however, remains controversial in the pig. To determine whether domestic pigs have a...

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