Abstract: Ob jective The teeth of rats grow rapid ly.In order to improve the animalwelfare in rats， to promote the normal growth and development of teeth，to ensure the correctness of the tests and the result，and to determine the feasibility of the using of the Lesser Khingan Range white birch molars，to provide theoretical basis for future research on animal toys.Method We use the molar rod thatmade up with the Betula papyrifera in the Lesser Khingan Range， M illettia Laurentii， im itation wood ivory and stainless steel water mouth to explore the body weights， food consumption， viscera indexes and serum biochemical indexes in the SD rats feeding process.Result Showed that the Betula papyrifera molar rod have no significant effects on the growth and development of rats.The Betula papyrifera molar rod in the Lesser Khingan Range have practicality and feasibility，can helps rats grow and develop，improve animal welfare in rats.

Key words: animal welfare, molar rods, rats

摘要： 目的 大鼠在生长过程牙齿发育较快，为提高大鼠动物福利，促进牙齿的正常生长发育，确保试验顺利进行与结果的准确性，并确定小兴安岭白桦木磨牙棒使用的可行性，为以后动物玩具的研究提供理论依据。方法 采用小兴安岭白桦木、鸡翅木、仿象牙木、不锈钢饮用水嘴作为大鼠磨牙棒，探究饲喂过程中SD大鼠的体质量、摄食量、脏器指数和血清生化指标。结果 表明白桦木磨牙棒对大鼠生长发育指标并无明显的影响。结论 小兴安岭白桦木磨牙棒具有实用性和可行性，有助于大鼠生长发育，提高大鼠的动物福利待遇。

关键词: 动物福利, 磨牙棒, 大鼠