Scalera G
Istituto di Fisiologia Umana, Università di Modena, Italy.
Physiol Behav. 1992 Nov;52(5):935-43. doi: 10.1016/0031-9384(92)90374-b.
Two behavioral experiments were performed to determine if the housing conditions modify taste preferences, body weight gain, food and fluid intake, and alimentary diurnal pattern in adult male rats. In Experiment 1, a two-bottle 24-h preference test (salt, sweet, sour, bitter solutions versus deionized water) was performed in singly, dually or multiply housed rats. In Experiment 2, the same sapid solutions as Experiment 1 and water were contemporaneously offered to singly, dually, or multiply housed rats. Crowded rats drank more water, sweet solution, and total fluid, but less salt solution than singly or dually housed rats during dark and whole-day periods. All rats preferred sour solution, but not bitter solution, to water. In both experiments, crowded rats gained less body weight and ate less food than dually or isolated rats. These results suggest that the housing conditions influence taste preferences, food and fluid intake, body weight gain, but not alimentary diurnal pattern in rats. An important implication of these results is that in experiments in which appetite and taste are dependent variables, all rats should be housed under the same social and environmental conditions.
进行了两项行为实验，以确定饲养条件是否会改变成年雄性大鼠的味觉偏好、体重增加、食物和液体摄入量以及饮食昼夜模式。在实验1中，对单笼饲养、双笼饲养或多笼饲养的大鼠进行了一项两瓶24小时偏好测试（盐、甜、酸、苦溶液与去离子水）。在实验2中，将与实验1相同的有味溶液和水同时提供给单笼饲养、双笼饲养或多笼饲养的大鼠。在黑暗期和全天，拥挤饲养的大鼠比单笼或双笼饲养的大鼠饮用更多的水、甜溶液和总液体，但饮用的盐溶液更少。所有大鼠相对于水更喜欢酸溶液，但不喜欢苦溶液。在两项实验中，拥挤饲养的大鼠比双笼或单笼饲养的大鼠体重增加更少，进食更少。这些结果表明，饲养条件会影响大鼠的味觉偏好、食物和液体摄入量、体重增加，但不会影响大鼠的饮食昼夜模式。这些结果的一个重要意义是，在以食欲和味觉为因变量的实验中，所有大鼠都应饲养在相同的社会和环境条件下。
