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对作者培育的近交系ＮＪＳ小鼠的繁殖性能与生长发育进行观察，结果表明：ＮＪＳ小鼠的基代虽来源于ＫＭ远交群，但由于高度近交和定向选择，其产仔、泌乳等繁殖性能已大大下降。有关繁殖性能指标为：配产间隔２５．９±４．５／ｄ、胎间隔４７．１±１１．４／ｄ、窝产仔数７．６±２．６／只、离乳仔数６．２±２．３／只、离乳率８０．５±２５．２／％、初生个体重１．５５±０．１２／ｇ、泌乳力４４．６７±１７．１２／ｇ、离乳个体重１０．３５±０．９５／ｇ。３０、６０、９０日龄雄鼠个体重分别为：１７．０±２．１／ｇ、２７．８±１．７／ｇ、３１．８±２．１／ｇ，雌鼠分别为：１５．８±０．９／ｇ、２３．５±１．４／ｇ、２５．５±１．６／ｇ。与其他近交系相比较，ＮＪＳ小鼠的繁殖性能与Ｃ＿（５７）ＢＬ／６近似，比ＢＡＬＢ／ｃ、ＤＢＡ／２显著高（Ｐ＜０．０１）。离乳前后ＮＪＳ小鼠的生长速度与ＢＡＬＢ／ｃ近似，比Ｃ（５７）ＢＬ／６、ＤＢＡ／２显著快（Ｐ＜０．０１）。
The inbred NJS mice that were cultivated by the authors were observed for their reproductive performance and growth and development. The results showed that although the primary generation of NJS mice originated from the KM outbred group, their inbred and lactation due to high inbred and directional selection Reproductive performance has dropped significantly. The reproductive performance indicators: with delivery interval 25.9 ± 4.5 / d, fetal spacing 47.1 ± 11.4 / d, litter size 7.6 ± 2.6 / only, the number of baby 6 .2 ± 2.3 / only, the rate of 80.5 ± 25.2 /%, the newborn body weight 1.55 ± 0.12 / g, lactation 44.67 ± 17.12 / g, Body weight 10.35 ± 0.95 / g. The body weight of males at 30, 60 and 90 days were 17.0 ± 2.1 / g, 27.8 ± 1.7 / g and 31.8 ± 2.1 / g, respectively, while females were 15 .8 ± 0.9 / g, 23.5 ± 1.4 / g, 25.5 ± 1.6 / g. Compared with other inbred lines, the reproductive performance of NJS mice was similar to that of C57BL / 6, which was significantly higher than BALB / c and DBA / 2 (P <0.01). The growth rate of NJS mice before and after weaning was significantly higher than that of BALB / c (P <0.01) than that of C (57) BL / 6 and DBA / 2.