Summary
Minute ventilation (V E), tidal volume (V T), respiratory frequency (f) and clavicular air sac gas composition were measured in conscious domestic fowl breathing air and hypoxic gas mixtures at neutral (18±1°C) and raised (33±1°C) air temperatures. Increases inV E caused by inhalation of 10%, 8% or 6.5% O2 in N2, respectively, were independent of temperature although at each level the absoluteV E was ca. 21·min−1 greater in the panting birds. Changes in respiratory pattern during hypoxia were markedly dependent on temperature. At 18°C almost all of the increasedV E resulted from increasedf. At 33°C hypoxia led to a strong suppression off and increase inV T. It is concluded that hyperthermia and hypoxia are additive and non-interactive in their effects on ventilatory drive, in agreement with previously reported effects of hypercapnia and physical exercise on breathing in panting fowl.
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Brackenbury, J., Gleeson, M. Separate and combined effects of temperature and hypoxia on breathing pattern in the domestic fowl. J Comp Physiol B 156, 109–113 (1985). https://doi.org/10.1007/BF00692932
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DOI: https://doi.org/10.1007/BF00692932