Abstract: Energy intake, digestibility, assimilation rate, the length and weight of digestive tract were compared between Rattus niviventer confucianus and Rattus norvegicus. Experiments were carried out in metabolic cages, and peanut and rice were used as diets. The daily energy intake of R.niviventer confucianus(1069.43 KJ.(kg^0.75)^-1)was higher than that of R.norvegicus(708.55 KJ.(kg^0.75)^-1), and digestibility of peanut in R. norvegicus(95.38%)was also higher than that of R. norvegicus(91.84%). However , digestibility and assimilation rate were similar between two kinds of rodents when they fed on rice. At the same time, we found the length of digestive tract of R.niviventer confucianus was significantly longer than of R. norvegicus. The result indicated larger digestive tract and higher digetstibility of R.niviventer confucianus was an adaptive strategics to the worse food conditions.

Key words: Rattus niviventer confucianus, Rattus norvegicus, Digestibility, Assimilation rate, Morphology of digestive tract

摘要： 比较研究了社鼠和褐家鼠的摄入能、消化率、同化率以及消化道长度和重量的差异。结果表明，在饲养条件下，社鼠每天摄入能为1069.43KJ.(kg^0.75)^-1，高于褐家鼠(708.55KJ.(kg^0.75)^-1 )，社鼠对花生的消化率(95.38%)较褐家鼠(91.74%)为高，但两种动物对大米的消化率和同化率较为接近。社鼠消化道各器官（除小肠）的长度和重量皆明显高于褐家鼠。具有较大的消化道和较高的消化率是社鼠对野外较差食物条件的适应对策。

关键词: 杜鼠, 褐家鼠, 消化率, 同化率, 消化道形态