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J Appl Physiol 44: 81-84, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 44, Issue 1 81-84, Copyright © 1978 by American Physiological Society

ARTICLES

Thermally induced peripheral blood flow changes in chickens

W. F. Nolan, W. W. Weathers and P. D. Sturkie

Changes in wattle blood flow (Q) and vascular resistance (R) were examined during both local heating of the wattle and/or general body heating of unanesthetized, male White Leghorn chickens. Q increased and R decreased during both local and general heating. Termination of heating reversed the response. Beta stimulation with isoproterenol markedly reduced R and increased Q in normothermic birds, suggesting the presence of beta receptors in the wattle vasculature. Alpha blockade with phenoxybenzamine also resulted in pronounced vasodilatation, suggesting tonic alpha-sympathetic tone in the wattle vasculature under normothermic conditions. Neither cholinergic blockade with atropine sulfate nor beta-adrenergic blockade with propranolol altered the vascular response to general heating when administered near its peak. Release of alpha-sympathetic tone is believed to subserve the response to general heating.


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