Abstract
1. 1.|Chicks were subjected to three stresses—handling alone or handling plus heat or cold. An immediate hyperlipacidaemia occurred only in the cold-stressed birds thus indicating the importance of lipid in the thermoregulatory response to cold. 2. 2.|Lipolysis in chicks treated with prostaglandin E 1 (PGE 1) was reduced by one quarter but the birds did not show impaired thermoregulatory ability. 3. 3.|Plasma lactate concentrations were significantly increased in PGE 1-treated chicks exposed to cold, indicating an enhanced shivering thermogenesis. 4. 4.|Impairment of muscular activity with propranolol reduced the thermoregulatory ability of PGE 1-treated chicks. 5. 5.|The nature of an avian non-shivering thermoregulatory mechanism is discussed.
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