东方田鼠长江亚种（Microtus fortis calamorum）的生长与发育

１９９３年１０月－１９９５年５月室内饲养东方田鼠的结果显示：幼鼠３日龄耳壳完全直立，４日龄能辨雌雄，８日龄披毛长全，８—１０日龄睁眼，１０日龄左右牙齿长全，１５—２０日龄可独立生活。冬季出生的约２个月性成熟，春季出生的约５０天性成熟。其体重生长曲线可用Ｌｏｇｉｓｔｉｃ曲线方程进行拟合。依据上述特征划分东方田鼠的四个发育阶段：（一）乳鼠阶段，初生至１０日龄；（二）幼鼠阶段，１１至２０日龄；（三）亚成年鼠阶段，２１至５０（或６０）日龄；（四）成年鼠阶段，５１（或６１）日龄以上。

GROWTH AND DEVELOPMENT OF YANGTZE VOLE (MICROTUS FORTIS CALAMORUM)IN DONGTING LAKE AREA

Laboratory observations on the growth and development of Yangtze vole juveniles were carried out from October,1993 to May,1995.Ear erechon ocurred when the pups were 3 days old,sex can be distinguished at the age of 4 days.Hair cover was fully.grownat foe age of8 days.Eyes opened at about 8 to 10 days old.All teeth emerged at about 10 days old.Juveniles can live independently at 15 to 20 days old. The pups born in winter matured with in about two months after birth and those born in spring matured with in about 50 days after birth Body weight data can be fit with the logistic curve. According to the growing characteristics,we divided the life cycle of Yangtze vole into four stages:infancy stage,from borning day to 10 days old,juvenile stage,from 11 to 20 days old; subadult stage;from 21 to 50(or 60)days old,and adult stage,over 51(or 61)days old.