Effects of Noise on Growth, Egg Laying and Mineral Contents of Egg Shell in Hens

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  • ニワトリの発育,産卵ならびに卵殻の無機質含量に及ぼす騒音の影響
  • ニワトリ ノ ハツイク サンラン ナラビニ ランカク ノ ムキシツ ガンリョウ

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Experiments were carried out to elucidate the effects of noise on the growth of chicks and egg laying in hens. Twenty chicks were raised in a sound-proof room illuminated all day long. At two weeks of age, they were divided into two groups: a control group(C) and a noise-load-ed group(N). The latter group was loaded with noise of 70-75 phon, recorded from highway traffic, every other hour for 21 weeks. 1. Mean body weights was lower in group N than in group C in each week of the noise-loaded period. The difference between the two groups increased gradually to 147g in 20 weeks of age. 2. Body weight of one to four in group N was usually below the lower critical limits of body weight in group C. 3. First egg laying appeared a little later in group N than in group C. 4. The average rate of egg laying was lower in group N than in group C every week during the noise-loaded period. The largest difference was 20 per cent. 5. There were no significant differences in the contents of calcium, magnesium and phosphorous in the egg shell. 6. After noise-loading ended, body weight and egg laying in group N approached those in group C.

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