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Am J Physiol Regul Integr Comp Physiol 279: R1190-R1195, 2000;
0363-6119/00 $5.00
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Vol. 279, Issue 4, R1190-R1195, October 2000

Panting in reindeer (Rangifer tarandus)

Øyvind Aas-Hansen, Lars P. Folkow, and Arnoldus Schytte Blix

Department of Arctic Biology and Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway

Two winter-insulated Norwegian reindeer (Rangifer tarandus tarandus) were exposed to air temperatures of 10, 20, 30, and 38°C while standing at rest in a climatic chamber. The direction of airflow through nose and mouth, and the total and the nasal minute volumes, respectively, were determined during both closed- and open-mouth panting. The animals alternated between closed- and open-mouth panting, but the proportion of open-mouth panting increased with increasing heat load. The shifts from closed- to open-mouth panting were abrupt and always associated with a rise in respiratory frequency and respiratory minute volume. During open-mouth panting, the direction of airflow was bidirectional in both nose and mouth, but only 2.4 ± (SD) 1.1% of the air was routed through the nose. Estimates suggest that the potential for selective brain cooling is markedly reduced during open-mouth panting in reindeer as a consequence of this airflow pattern.

heat stress; respiration; selective brain cooling; temperature regulation; thermal tachypnea


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