关键词: 布氏田鼠, 肥满度

Abstract: The relative fatness of Brandt's voles was calculated by the following formula: K=W/L³, W stands for body mass and L represents body lenghth There were no significant sexual differences with respect to relative fatness and the over winterings were fatter than voles born of this year.There were seasonal variations in the relative fatness.The fatness of overwlnterings decreased from April to July .But that of voles born of this year were highest in Spring and decreased during Summer, then increased in Autumn. This seasonal change pattern of relative fatness reflected the tactics of Voles'alloting energy between their offsprings and themselves. The relative fatness of population-increasing-year was significantly higher than that of population-decreasing-year.