Abstract: The dominant species of rodents in Inner Mongolian Steppe is ground seuirrel(Spermophilus dauricus)，which has obvious seasonal characteristics，such as the corresponding variation in its gross body composition and hibernation．During growing period from late June to early August，the juveniles gain body weight very rapidly，and the relations between body weight and the percents of ash, phosphorus and magnesium are positively correlated while percent, age of water is negatively correlated with body weight，and the percentage of protein is not correlated in different stages．After weaning，the adult females large amount of body nutritious components have been expended，which are much less than those in males in the same group．Just prior to hibernation the adult males body nutritious components have high indexes in lipid content(25.27-27. 99)，caloric value(11.63-13.05kj／g)，ratio of caleium and phosphorus (1.81— 1.86)and so on．

Key words: Ground squirrel (Spermophilus duricus), Gross body composition Index of phisiologic biochemistryt．Caloric value

摘要： 达乌尔黄鼠的身体组成成分，随各发育阶段以及每年的不同季节而有相应的变化。幼鼠脂肪、灰分、磷和镁的百分数与体重增长呈正相关，水分百分数与体重增长呈负相关，蛋白质百分数与体重增长不相关。母鼠授乳期目大量营养成分被消耗，此耐母鼠身体的营养成分及能量皆比同时期的雄鼠少。在接近冬眠前，成年雄鼠身体的脂肪含量，热值和钙镁比值等都相应比雌鼠高。

关键词: 达乌尔黄鼠, 身体组成成分, 生理生化指标, 热值