Suppression of annual plasma testosterone and thyroxine cycles in the edible dormouse Glis glis under constant photoperiod at 24 degrees C.

Exposure of male edible dormice all year round to an unvarying photoperiod and warm temperature disrupted their biological cycles; hibernation was almost completely suppressed, and short lived infradian cycles of body weight, and of plasma testosterone and thyroxine were measured instead of the normal annual pattern.