報告書番号

483026

タイトル（和文）

低周波空気振動の家畜におよぼす影響－ニワトリの産卵・乳牛の泌乳－

タイトル（英文）

EGG AND MILK PRODUCTION OF LIVESTOCK EXPOSEDTO THE INFRASOUND OF SEVERAL FREQUENCIES AT THREE SOUND LEVELS

概要 （図表や脚注は「報告書全文」に掲載しております）

大規模工場，交通機関，ダムの放水等によって生じる５０Ｈｚ以下の低周波空気振動による人体への健康影響の調査に鑑み，低周波空気振動のニワトリの産卵および乳牛の泌乳におよぼす影響を調べたものである。ニワトリについては２４８日令の産卵最盛期にある産卵鶏に周波数１７，３１Ｈｚで音圧レベル９０，８０，７０ｄＢの３段階で各３週間，周波数２４Ｈｚで１００，９０，８０ｄＢの３段階で各１１週間暴露した。乳牛については５頭の泌乳牛に１７，２４，３１Ｈｚで音圧レベルは１００～８０ｄＢの範囲で各２週間。また，２４Ｈｚで１００～９０ｄＢの範囲で２週間の暴露を休止期を置いて３回繰り返した。ニワトリでも乳牛でも低周波空気振動の暴露によって産卵や泌乳が低下することはなく低周波空気振動の影響は認められなかった。

概要 （英文）

THE PRESENT STUDY CARRIED OUT TO INVESTIGATEWHETHER INFRASOUND HAS ANY EFFECTS ON EGG PRODUCTION OF HENS AND MILK PRODUCTION OF COWS.INFRASOUND FREQUENCIES OF 17,24 AND 31 HZ WERE TESTED AT SOUND LEVELS RANGED FROM 70 AND 100 DB IN THIS STUDY. 1.EGG PRODUCTION OF HENS FORTY BIRDS OF THIRTY-FIVE WEEKS OLD HENS IN FULL EGG PRODUCTION WERE EXPOSED TO THE INFRASOUND FREQUENCIES OF 17 AND 31 HZ AT SOUND LEVELS OF 70,80 AND 90 DB FOR THREE WEEKS AND OF 24 HZ AT SOUND LEVELS OF 80,90 AND 100 DB FOR ELEVEN WEEKS RESPECTIVELY. 2.MILK PRODUCTION OF COWS TWO DIFFERENT KINDS OF EXPERIMENTS WERE CARRIED OUT. 1)SUCCESSIVE EXPOSURE TO 17,24 AND 31 HZ INFRASOUND FIVE DAIRY COWS WERE TIED IN STANCHION STALLS FOR SEVEN HOURS AND MADE FREE IN THE OPEN SHED FOR THE REMAINING 17 HOURS A DAY.THEY WERE CONTINUOUSLY EXPOSED TO THE SOUNDLEVELS RANGED FROM 80 TO 100 DB FOR TWO WEEKS IN EXPOSURE EXPERIMENTS WHICH WERE CONDUCTED SUCCESSIVELY AT TWO WEEKS INTERVALS. 2)THREE TIMESEXPOSURE TO 24 HZ INFRASOUND FIVE DAIRY COWS WERE CONFINED IN A SQUAREOPEN HOUSING BARN OF 100 SQUARE METERS IN AREA FOR 22 HOURS AND MOVED TO A MILKING PARLOUR IN THE MORNING AND EVENING.THEY WERE CONTINUOUSLY EXPOSED TO SOUND LEVELS RANGING FROM 90 TO 100 DB OF 24 HZ FOR TWO WEEKS.THE EXPOSURE WAS REPEATED THREE TIMES AT AN INTERVALS OF TWO WEEKS. THE RESULTS WERE THAT NO SIGNIFICANT CHANGES OR REDUCTIONS IN BOTH THE EGG AND MILK PRODUCTION WERE CAUSED BY EXPOSURE TO ANY KINDS OF INFRASOUND FREQUENCIES AND THEIR SOUND LEVELS.

報告者

キーワード