137Cs内部照射が雄生殖器に与える影響についての実験的研究 : 第1編 137Cs内部照射を受けた雄ハツカネズミによる交配が,交尾率,妊娠率および仔数に及ぼす影響について
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The ability of the reproduction of male mice received internal exposure of 137Cs has been observed.For dd-strain male mice, 137Cs was administered intraperitoneally at the rate of 8μc Cs per gram of body weight on the first group, and 4μc Cs per gram on the second group. Administered males were mated with non-treated females 0∼10, 10∼20, 20∼40, 30∼40, ………90∼100 days following the radiocesium administration. New females were mated for every 10 days at the rate of three females for one male.By checking vaginal plug, copulation was examined every morning. From twelve to forteen days after copulation, the mated females were killed, their uteri opened, and pregnancy and litter size examined.The results are as follows:(1) The copulation-rate decreased from 20 to 70 days after the 137Cs administration. Especially in the first group, the decrease rate was remarkable between 60 and 70 days after the treatment.(2) The pregnancy-rate decreased almost in the same way as the above. In the first group, falling steadily from 10∼20 days, finally it reached zero between 60∼70 days, and then recovered gradually.(3) The litter size showed a similar pattern with the pregnancy rate.(4) The number of dead embrios had a tendency to increase, especially in the first group. But the type or pattern throughout this experiment did not show any systematic changes, although the ratio of dead embrios to live embrios increased significantly almost all the term in this experiment.
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- 137Cs内部照射が雄生殖器に与える影響についての実験的研究 : 第2編 137Cs内部照射を受けたハツカネズミ睾丸の組織変化の経時的追求と137Csの体内分布について
- 137Cs内部照射が雄生殖器に与える影響についての実験的研究 : 第1編 137Cs内部照射を受けた雄ハツカネズミによる交配が,交尾率,妊娠率および仔数に及ぼす影響について