Cardiac catecholamine levels were spectrofluorometrically determined in adult male chickens following two treatments: (1) denervation of the cardioaccelerator nerves or (2) reserpine administration after acclimatization of the birds to low, intermediate, or high ambient temperatures. Marked depletion of cardiac catecholamines (80 to 90%) was found 2 weeks after denervation and 24 h after injection of reserpine. Acclimatization did not alter the response to reserpine.

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