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Core temperature values at different times over a 24-hour period in young ringdoves treated with 0.25 mg melatonin/kg of body weight (b.w.) 1 hour before lights off (7 PM) (A) and in old ringdoves treated with 2.5 mg melatonin/kg of b.w. 1 hour before lights off (7 PM) or with 300 mg tryptophan/kg of b.w. 1 hour after lights on (9 AM) (B). Each value represents the mean ± SD of 10 determinations. *p < .01 with respect to the values obtained in their respective control groups.
