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Am J Physiol Regul Integr Comp Physiol 281: R519-R527, 2001;
0363-6119/01 $5.00
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Vol. 281, Issue 2, R519-R527, August 2001

Energy intake and fur in summer- and winter-acclimated Siberian hamsters (Phodopus sungorus)

Alexander S. Kauffman1, Alessandra Cabrera1, and Irving Zucker1,2

Departments of 1 Integrative Biology and 2 Psychology, University of California, Berkeley, California 94720

Few studies have directly addressed the impact of fur on seasonal changes in energy intake. The daily food intake of Siberian hamsters (Phodopus sungorus) was measured under simulated summer and winter conditions in intact animals and those with varying amounts of pelage removed. Energy intake increased up to 44% above baseline control values for approximately 2-3 wk after complete shaving. Increases in food intake varied with condition and were greater in hamsters housed in short than long day lengths and at low (5°C) than moderate (23°C) ambient temperatures. Removal of 8 cm2 of dorsal fur, equivalent to 30% of the total dorsal fur surface, increased food intake, but removal of 4 cm2 had no effect. An 8-cm2 fur extirpation from the ventral surface did not increase food consumption. Food intake was not influenced differentially by fur removal from above brown adipose tissue hot spots. Fur plays a greater role in energy balance in winter- than summer-acclimated hamsters and conserves energy under a wide range of environmental conditions.

pelage; insulation; thermoregulation; photoperiod


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