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Swiss成年雌性小鼠138只．随机分为对照组（18只）和实验组（20只）。实验组小鼠切除颌下腺，对照组小鼠保留颌下腺。待伤口愈合后，与正常Swiss雄性小鼠合笼交配，观察妊娠情况。结果：完成妊娠时实验组平均每只母鼠的产仔数是9．3±1．76（只），对照组是10．6±0．97（只），二者有显著性差异。在孕第6、7天时，实验组平均每只母及怀胎鼠数且为11±1．87（只），对照组为10．75±07，二者无显著性差异。结论：颌下腺切除可以使孕鼠完成妊娠时产仔数目减少。
138 Swiss adult female mice. Randomly divided into control group (18) and experimental group (20). The submandibular gland was excised from the experimental group and the submandibular gland from the control group. After the wound healed, mice were mated with normal Swiss male mice to observe the pregnancy. Results: At the completion of pregnancy, the average litter size per litter in the experimental group was 9.3 ± 1.76 (only) and that in the control group was 10.6 ± 0.97 (only), with significant differences between the two groups. On the 6th and 7th day of pregnancy, the average number of mothers and pregnant rats in the experimental group was 11 ± 1.87 (only) and that of the control group was 10.75 ± 07. There was no significant difference between the two groups. Conclusions: Submandibular gland resection can reduce the number of pregnant litter when pregnant rats complete pregnancy.