Relationship between autonomic and behavioral thermoregulation in the mouse.
Preferred ambient temperature (Ta) was measured in nine mice of the BALB/c strain using a temperature gradient. When tested over four consecutive days the mean preferred Ta was 30.9 degrees C. In another study using the same animals, metabolic rate, evaporative water loss, whole-body thermal conductance, and colonic temperature were measured at specific Ta's over a range of 18 to 34 degrees C. The preferred Ta of 30.9 degrees C was associated with the lower critical Ta (i.e., Ta below which metabolic rate increased) a 57% elevation in evaporative water loss when expressed in units of mg water evaporated per ml consumed oxygen, a thermal conductance that was 92% above baseline levels, and a normothermic colonic temperature of between 37.0 to 37.5 degrees C. The data indicate that mice will select an environmental temperature associated with a minimal energy expenditure but a higher than minimal rate of evaporation and higher thermal conductance.
D000818:Animals; D001341:Autonomic Nervous System / Q000502:physiology*; D001522:Behavior, Animal / Q000502:physiology*; D001833:Body Temperature Regulation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010101:Oxygen Consumption; D013696:Temperature