CSF ion composition and manipulation during thermoregulation in an avian species, Gallus domesticus.
1. At thermoneutrality (28 degrees C), CSF Na+:Ca2+ in hens was 61.66; under thermal stress (39 degrees C), it changed to 59.38 (30 min), 62.58 (3 hr), and 52.44 (10 hr); no change in ratio occurred at 15 degrees C. 2. ICV Ouabain and/or EGTA increased body temperature (TR) but not respiration rate (RR) at 39 degrees C. 3. At 28 degrees C, Ouabain decreased, and EGTA increased, TR and RR. 4. Ca2+ may be more critical than Na+ in thermoregulation. 5. Heat stress appears to stimulate Na+-transport mechanisms other than Na+-ATPase. 6. RR appears to be a function of TR, not of ion balance.
Maki
A A
AA
Department of Animal Science, University of Nebraska-Lincoln 68583-0908.
Beck
M M
MM
Gleaves
E W
EW
DeShazer
J A
JA
Eskridge
K M
KM
D000818:Animals; D001833:Body Temperature Regulation / Q000187:drug effects / Q000502:physiology*; D002118:Calcium / Q000134:cerebrospinal fluid*; D002645:Chickens / Q000134:cerebrospinal fluid*; D004533:Egtazic Acid / Q000494:pharmacology; D005260:Female; D007276:Injections, Intraventricular; D010042:Ouabain / Q000494:pharmacology; D012964:Sodium / Q000134:cerebrospinal fluid*
D004533:Egtazic Acid; D010042:Ouabain; D012964:Sodium; D002118:Calcium