1. 1. Brain (hypothalamic), skin and body temperatures were measured in hand-reared acclimated (Acc, n = 5) and non-acclimated (NAcc, n =7) rock pigeons (Columba livia, mean body mass 237 g) exposed to increasing ambient temperatures (Ta) (30-60°C) and low humidities. 2. 2. In non-panting Acc birds, brain temperature gradually increased from 40.1 ± 0.4°C at 30°C to 41.2 ± 0.4°C at 60°C Ta. A mean body temperature (Tb) of 41.2 ± 0.2°C was measured at Ta up to 50°C; an increase of 1.1°C was observed at 60°C (Tb 42.2 ±0.6°C). 3. 3. In Acc panting birds exposed for 2 hr to 60°C, Thy was 41.9 ± 0.8°C and Ts was somewhat (but insignificantly) higher, i.e., 42.2 ± 0.7°C. It looks as if both values were increased as a result of a slight hyperthermia that developed (Tb = 43.5 ± 0.9°C). 4. 4. The significance of the present results for evaluating neuronal thermoresponsiveness of birds' hypothalamus is discussed.
|Number of pages||6|
|Journal||Comparative Biochemistry and Physiology -- Part A: Physiology|
|State||Published - 1989|
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