Abstract
The thermoneutral zone of sand rats was 31 ± 1.5°C and that of rats was 30 ± 0.5°C; at 30°C the BMR was 0.52 ± 0.026 ml O 2/g.hr for sand rat and 0.86 ± 0.019 for rat. During prolonged fasting O 2 consumption of sand rats fell during 36 hours and then rose to the fed value. CO 2 production fell with the onset of fasting and remained constant over 2 days. In the rat O 2 consumption did not change, whereas CO 2 production slowly fell. Changes in R.Q., corrected for non-protein nitrogen excretion, suggested a shift to fat catabolism in the rat but not in the sand rat. Changes in ketone body excretion and blood glucose concentrations support these conclusions. The difference in metabolism of these species probably reflects the adaptation of the sand rat to its desert habitat.
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