This study contrasted the progenitive and growing functions of three differently closing breeds mice,KM,NIH and ICR.The results showed that the sexual maturity of KM mouse was earlier than that of NIH and ICR,and ICR was the latest.The paranumber of deliveries per socket NIH was more than that of NIH and ICR,and NIH was the least.The milking of NIH and ICR was higher than KM.The average weight of firsbom mice of NIH was higher than that of KM and ICR.After ablactation th...