Fantino M, Cabanac M
Physiol Behav. 1984 Feb;32(2):183-90. doi: 10.1016/0031-9384(84)90127-6.
In a first experiment, the amount of food hoarded in three hour sessions (HB) by eight food deprived rats, was measured at three ambient temperatures: 30, 17.5 and 5 degrees C. At the three temperatures, the mass of food pellets hoarded by the rats was linearly related to the rats' body weight (BW) with a negative slope. The slope of the regression lines was significantly higher at 5 and 17.5 degrees C than at 30 degrees C. In a second experiment, BW and HB of ten non-deprived rats were measured every day, first at 30, then at 10 degrees C, then at 30 degrees C again (70 days). In the cold environment, HB immediately increased without BW loss. This effect was immediately reversible by the adjunction of an insulating styrofoam mattress. HB of non deprived rats in the cold was therefore more a thermoregulatory behavior than an alimentary response. In a third experiment, ad lib fed or deprived rats could hoard either food pellets or styrofoam lumps at 30 degrees C or at 5 degrees C. In the cold environment, when non-deprived, the rats hoarded styrofoam rather than food. However, as soon as they were food deprived, they reversed their choice and hoarded food rather than styrofoam. It is concluded that food can be hoarded as a thermal insulator in a cold environment but HB is mainly an alimentary response increased by a cold stress.
在第一个实验中，对八只处于食物匮乏状态的大鼠在三个环境温度（30℃、17.5℃和5℃）下三小时时间段内囤积的食物量（HB）进行了测量。在这三个温度下，大鼠囤积的食丸质量与大鼠体重（BW）呈线性关系，斜率为负。5℃和17.5℃时回归线的斜率显著高于30℃时的斜率。在第二个实验中，每天测量十只非饥饿大鼠的体重和HB，先是在30℃，然后在10℃，之后再回到30℃（共70天）。在寒冷环境中，HB立即增加，体重无损失。添加隔热的聚苯乙烯泡沫床垫后，这种效应可立即逆转。因此，寒冷环境中未饥饿大鼠的HB更多是一种体温调节行为，而非进食反应。在第三个实验中，自由进食或处于饥饿状态的大鼠可在30℃或5℃下囤积食丸或聚苯乙烯泡沫块。在寒冷环境中，未饥饿的大鼠囤积聚苯乙烯泡沫而非食物。然而，一旦它们处于食物匮乏状态，就会改变选择，囤积食物而非聚苯乙烯泡沫。研究得出结论，在寒冷环境中，食物可作为隔热材料被囤积，但HB主要是由冷应激增强的进食反应。
