Respiration in Exercising Fowl

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Abstract
Oxygen consumption, respiratory frequency, and the of expiratory and interclavicular air sac gases were continuously monitored in six female domestic fowl trained to exercise on a treadmill for 10 min periods at normal or elevated air temperatures. At normal temperatures (20 ± 2 °C) the cost of locomotion rose from 0·46 ml O2 kg-1 m-1 at 0−3 km h-1 to 0·77 ml O2 kg-1 m-1 at the maximum speed of 4·3 km h-1. At 32 ± 2°C, increased by as much as 20% compared to normal temperatures. Hyperventilation occurred at all speeds and at both normal and elevated temperatures. End-tidal and interclavicular increased in a parallel manner with speed, the latter remaining consistently 6−7 Torr less than the former both at rest and during exercise.