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本文在笔者前期工作的基础上，根据布氏田鼠15项生长指标的主分量分析结果，筛选出以头骨上齿隙作为划分布氏田鼠相对年龄组客观而简便实用的指标。该鼠的头骨上齿隙没有性别差异，对雌雄鼠可采用同一标准同时划分其年龄组。通过进一步分析，将其划分为五个年龄组：幼年组的上齿隙在6．49mm以下，亚成年组为6．50～7．33mm，成年一组为7．34～838mm，成年二组为8．39～9．43mm，老年组在9．44mm以上。此外，本文尚就年龄组成及其季节变化、年龄与繁殖等方面进行了分析。
Based on the preliminary work of the author and based on the principal component analysis of 15 growth traits of Brandt’s voles, the article screened out the objective and simple and practical indicators of the relative age group of Brandt’s vole. There is no gender difference in the backlash of the mouse skull, and the age group can be divided equally between male and female mice using the same standard. Through further analysis, it is divided into five age groups: the upper teeth gap in young group is below 6.49mm, the sub-adult group is 6.50 ~ 7.33mm, the adult group is 7.34 ~ 838mm, adult group two 8.39 ~ 9.43mm, the elderly group is 9.44mm or more. In addition, this article also analyzes the age composition and its seasonal changes, age and reproduction.