Gosselin C, Cabanac M
Département de Physiologie, Faculté de Médecine, Université Laval, Québec, Canada.
Appetite. 1998 Aug;31(1):117-24. doi: 10.1006/appe.1997.0147.
Hoarding behavior of rats can be described by the equation y = ax + b, where y is the amount of food hoarded, x the rat's body weight, a the negative slope of the regression line, and b, the ordinate at zero abscissa. We repeatedly evaluated the parameters of this equation in six obese Zucker rats and six controls, from 8 to 32 weeks of age. The mean slope of the regression lines remained close to -11 in both groups of rats, until 24 weeks of age. From then on, the slopes of the obese rats decreased dramatically to c. -3, and remained as such for the rest of the experiment, while that of controls remained constant. At this age (24 weeks), controls weighed 453 +/- 14 g and obese rats 729 +/- 18 g. We suggest that the decreased slope of hoarding in obese rats was due to an increased cost of the hoarding behavior.
大鼠的囤积行为可用方程y = ax + b来描述，其中y是囤积的食物量，x是大鼠的体重，a是回归线的负斜率，b是横坐标为零时的纵坐标。我们在6只肥胖的 Zucker 大鼠和6只对照大鼠中，从8周龄到32周龄反复评估了该方程的参数。两组大鼠回归线的平均斜率在24周龄之前都保持接近 -11。从那时起，肥胖大鼠的斜率急剧下降至约 -3，并在实验的剩余时间保持不变，而对照组的斜率则保持恒定。在这个年龄（24周），对照组体重为453±14克，肥胖大鼠体重为729±18克。我们认为肥胖大鼠囤积斜率的降低是由于囤积行为成本增加所致。
