Conclusions It is of great value to improve the confirmation of the pregnant rat gestation and accuracy of the date of production by palpation and observation combined with computation method.

• 结论在推算法的前提下，结合触诊法、观察法进行综合判断，对提高孕鼠妊娠期的确定和分娩时间的准确性有重要的价值。