Abstract
1. 1. At thermoneutrality (28°C), CSF Na +: Ca 2+ in hens was 61.66; under thermal stress (39°C), it changed to 59.38 (30 min), 62.58 (3 hr), and 52.44 (10 hr); no change in ratio occurred at 15°C. 2. 2. ICV Ouabain and/or EGTA increased body temperature (TR) but not respiration rate (RR) at 39°C. 3. 3. A 28°C, Ouabain decreased, and EGTA increased, TR and RR. 4. 4. Ca 2+ may be more critical than Na + in thermoregulation. 5. 5. Heat stress appears to stimulate Na +-transport mechanisms other than Na +-ATPase. 6. 6. RR apppears to be a function of TR, not of ion balance.
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