PANTING AND TEMPERATURE REGULATION IN THE CHICKEN

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Abstract
Barred rock chickens were placed in a heating cabinet where internal temps. and respiratory movements were recorded as body temp. was raised. The critical panting temp. threshold varied with different birds. In only 1 of 33 expts. was it possible to obtain reflex panting. Sudden chilling of the birds'' heads invariably caused reflex inhibition of panting even though no appreciable lowering of internal body temp. occured. Central depression (nembutal) reduced panting depending upon the depth of narcosis. Deep narcosis abolished panting completely. Evidence is presented to show that the panting center is affected before the respiratory center. Central depressants raised the panting threshold in every instance. Lobeline sulfate caused respiratory stimulation resulting in a prompt but short-lived increase in amplitude followed by a longer lasting period of sensitization of the panting mechanism. Lobeline lowered the panting temp. threshold. Panting in the chicken depends upon 2 factors: the body temp. and the degree of sensitivity of the central mechanism.

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