褐家鼠种群繁殖规律的研究

A Study on the Propagating Law of the Rattus norvegicus Family

对褐家鼠种群繁殖规律的研究结果表明：该鼠可全年繁殖，每只成雌一年妊娠９．９６次，每胎产仔６．９４只，其幼鼠相对存活率秋季最高（６４．６％），冬季最低（３２．５％），各季节间的差异具有显著性（Ｆ＝４，１９９，Ｐ＜０．０５）。妊娠率高峰在３～９月份，与平均气温、降水量呈高度正相关（ｒ气温＝０．７８３Ｐ＜０．０１，ｒ降水＝０．９２１Ｐ＜０．０１），与植物变更、作物成熟、天故多少等因素也有一定关系。

This article gives a systematic study of the propagating law of Rattus norvegicus family. The result shows:that Rattus norvegicus can propagate all the year; for each adult female the average pregnancy times are as many as 9.96 each year,and each time an average of 6.94 baby Rattus norvegicus are borne;the surviving rate for the young in autumn is the highest(64.6%), and the lowest in winter(32.5%), with sharply difference during the four seasons.(F=4.199,P<0.05)The peak pregnancy rate is in March to September,and it is obvious positively correlated with the average temprature and rainfall.(rtemprature=0.783,p<0.01,rtainfall=0.921,P<0. 01) It also has some relationship with such factors as plant changing,crops riping and the number of natural enemies.