Thermoregulation and water relations of two East African antelopes: the hartebeest and impala.
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1. In controlled laboratory experiments rectal temperature, cutaneous moisture evaporation and breathing rate were studied in the hartebeest and impala antelope. 2. 2. At the high air temperatures (40–50°C), the sweating rate rose to 60 g H2O/m2 per hr and the respiratory rate to over 200/min in both species. 3. 3. The water balance of the two species was investigated when the antelope were either fully hydrated or dehydrated at the environmental temperatures of 22°C or alteration between 22 and 40°C at 12-hr intervals. The total body water was estimated in two hartebeest antelope which were allowed to graze freely on the dry pastures of the Athi River Plains.