ラット性殖機能への騒音影響
スポンサーリンク
概要
- 論文の詳細を見る
The present investigation was undertaken to determine the effects of exposure to noise on reproductive functions in rats.Wistar rats, aged 9 weeks at the start of the experiments, were exposed to a wide octave-band noise at an intensity of 100dB(C).Experiment 1: Male rats were divided into subjects and controls during the mating season. Female rats were divided into four groups: rats exposed to noise during mating and controls, and rats exposed to noise during pregnancy and controls. By combining male and female rats, eight experimental groups were obtained. During mating, animals were exposed to noise for four hours just prior to copulation. Pregnancy was ascertained by smear test in the morning after copulation. If the test was negative, copulation was repeated until positive results were obtained. Female rats with negative results after seven copulations were regarded as sterile. Pregnant rats were exposed to noise for four hours every day until delivery. Controls were kept in an environment with a noise level less than 40dB(A). The following measurements were made: copulation period, gestation period, birth rates, numbers of offspring, and birth weights.Experiment 2: Ninety rats were exposed continuously to noise during the entire mating season of seven days. Pregnant females were exposed continuously throughout gestation. Controls were kept the same environment as the above control group during both periods. Birth rates, numbers of offspring and birth weights were then measured.The results were as follows;1. Birth rates decreased significantly for female rats exposed to noise throughout both copulation and pregnancy.2. The number of offspring by group decreased significantly when the female rats exposed throughout both periods, but the numbers of offspring per delivery did not decrease.3. No effects of exposure to noise were observed for copulation period, gestation period, the numbers of offspring per delivery and birth weights.
- 日本衛生学会の論文
日本衛生学会 | 論文
- 子供の健康と化学物質安全性
- スギ花粉症の危険要因に関する症例対照研究
- ***の体脂肪率と除脂肪組織量による身体組成の分類と体力
- 児童生徒の肥満指標としてのベン指数の検討
- 妊娠時と授乳時のタンパク質栄養が出生仔の発育におよぼす影響