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关于幼鼠因饲养笼过小,活动受限,以至骨质中钙浓度下降的问题,迄今未见报导。作者在某项课题研究中意外地发现,用同样添加钙剂的配方饲料喂饲两组幼大鼠,经两周后发现,饲养于大笼的幼鼠平均增重显著高于饲养于小笼的幼鼠;5周后处死,测其股骨钙浓度,发现前者的平均浓度显著高于从者。一、材料与方法选用发育正常,断奶体重的60～80g的wistar系幼大鼠20只,雌雄各半,随机分为A、B两组,每组雌雄各5只。
There have been no reports so far about the problem of young mice being too small in cage and limited in activity, and the decrease of calcium concentration in the bone. The author unexpectedly found in a research project that two groups of young rats were fed with the same diet with calcium supplements. After two weeks, the average weight gain of the young rats fed on the big cage was significantly higher than that of the young rats Of young rats; 5 weeks after sacrifice, measuring the femur calcium concentration, found that the average concentration was significantly higher than the former. Materials and Methods Twenty healthy wistar rats weighing 60 to 80 g were used in this study. They were randomly divided into A and B groups, with 5 male and female in each group.