鳥の種類による卵の大きさと卵黄球の大きさの関連

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タイトル別名
  • Relations between the Overall Size and Yolk Sphere of Eggs from Different Birds
  • トリ ノ シュルイ ニ ヨル タマゴ ノ オオキサ ト ランオウキュウ ノ オオキサ ノ カンレン

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Smaller hens's eggs and yolks are composed of smaller yolk spheres, and vice-versa for larger yolks. We examined whether the size of the yolk spheres was related to the size of eggs and yolks in eggs from different birds. The cross-sectional area of the yolk spheres in the intermediate layer of steamed yolks was measured by the image-processing technique.<br>The weights of the eggs and yolks from different birds were greatest in the ostrich (>duck>White-Leghorn >Nagoya>guinea fowl>quail). The weight of an ostrich egg was about 25 times greater than that of hen eggs,, and about 120 times greater than that of quail eggs. The cross-sectional area of yolk spheres was greatest in the White-Leghorn (>ostrich>duck>Nagoya>quail>guinea fowl). There was no significant correlation between the cross-sectional area of yolk spheres and the yolk weight in eggs from different birds (r=0.12).<br>The kinds of bird egg cannot be identified by the different cross-sectional areas of the yolk spheres.

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