Dark J, Zucker I
Physiol Behav. 1986;38(6):851-4. doi: 10.1016/0031-9384(86)90053-3.
Short photoperiods reduce both body mass and food intake of male meadow voles. To help determine whether the primary effect of short day lengths is on regulation of some component of body mass or on the control of food consumption, voles housed in a long photoperiod were provided rations equivalent to those consumed by animals in short day lengths. Animals were transferred to a short photoperiod and after either 3 or 6 weeks of food restriction were fed ad lib. Both groups of voles overate after termination of food restriction and achieved seasonally appropriate body masses that were influenced by the duration of short photoperiod treatment. We conclude that short photoperiods gradually alter the regulated level of one or more components of body mass. We tested and failed to support the hypothesis that the subcutaneous fat depot is selectively spared during seasonal weight loss and thereby increases surface insulation. Thus, the proportion of adipose tissue reduction did not differ significantly among the epididymal, retroperitoneal, and inguinal-subcutaneous fat depots of voles housed in short day lengths.
短光照周期会降低雄性草甸田鼠的体重和食物摄入量。为了确定短日照长度的主要影响是对体重某些组成部分的调节还是对食物消耗的控制，给饲养在长光照周期下的田鼠提供与短日照长度下动物消耗的等量食物。将动物转移到短光照周期，在食物限制3周或6周后自由进食。两组田鼠在食物限制结束后均过度进食，并达到了受短光照周期处理持续时间影响的季节性适宜体重。我们得出结论，短光照周期会逐渐改变体重一个或多个组成部分的调节水平。我们测试了皮下脂肪库在季节性体重减轻期间被有选择地保留从而增加体表隔热的假设，但未得到支持。因此，短日照长度饲养的田鼠的附睾、腹膜后和腹股沟皮下脂肪库中脂肪组织减少的比例没有显著差异。
