关键词: 动物福利, 磨牙棒, 大鼠

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