都匀市褐家鼠种群特征的年龄变化

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中图分类号：S433.3；Q958.1 文献标识码：

A文章编号：2097-1354(2025)03-0085-07

Age Changes of Population Characteristics of Rattus norvegicus in Duyun City

ZHOU Zhaoxia， QIN Anrong， WU Tinghui Planting Industry Development Center of Duyun Cityof Guizhou Province，Duyun Guizhou 558o00，China

Abstract: Rattus noruegicus is the main pest in rural areas and towns in China,and it is listed in the first class of crop diseases and insect pests list in China. Studying the age change of the population characteristics of R . norvegicus is of guiding significance for analyzing the future population dynamics of R . norvegicus and forecasting the rodent situation. In order to find out the morphological characteristics，reproductive parameters and fatness of age changes of R . norvegicus ，and provide scientific basis for its prediction and scientific prevention and control，the morphological characteristics， reproductive parameters and fatness of age changes of R . noruegicus in Duyun City from 2Ol8 to 2O24 were analyzed. The results showed that the average weight，carcass weight，body length and tail length，hind foot length and ear height of R . norvegicus was 132.40g ， 108.98g ， 153.70mm ， 134.47mm ， 30.22mm and 19.75mm ，respectively. The morphological characteristics among different age groups was significantly different, with the increase of population age，the weight，carcass weight， body length，tail length，hind foot length and ear height continuous increasing. There were significant differences in population fertility between different age groups,among which,adult group I,adult group II and elderly group were the main reproductive groups of R . norvegicus. The overall pregnancy rate of individuals in the three age groups was 29.77% ， the average number of offspring was 8.17， the testicular decline rate was 88.20% ，and the reproductive index was O.978 3. The average fatness was 3.45g/cm3 ，and there was a significant difference in fatness among different age groups.

Key words: Rattus norvegicus ; morphological characteristics; reproductive parameters; fatness;change rule

褐家鼠（Rattus noroegicus）是人类伴生种，分布几乎遍及全球，除西藏自治区外，我国各省（区、市)均有分布[1]。（剩余7504字）