日本うずらの卵殼表面における色素沈着過程について

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タイトル別名
  • Superficial Pigmentation of Egg Shell in Japanese Quail, <i>Coturnix coturnix japonica</i>
  • ニホンウズ ラ ノ ランカク ヒョウメン ニ オケル シキソ チンチャク カテ

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The present investigation was initiated to supplement information as to the time of superficial pigmentation and to clarify the process of pigment deposition on the surface of the egg shell.<br>Generally speckles or blotches of the superficial pigment, characteristic to the individual quail hens, were found to have been settled from the onset of the egg production. However, in about 20% of the total birds, blotches of the pigment of the first several eggs appeared to be relatively small in size as compared to the subsequent eggs laid.<br>The superficial pigmentation is initiated approximately 2.8 hours before oviposition and terminated in about 30 minutes thereafter. The direct observation of the pigment deposition through the uterine wall in vivo revealed that the egg is dotted or spotted at the beginning of the deposition and that approximately 20 minutes after this process, deposition of a bulky pigment suddenly takes place. This is spread to form the blotches of pigment, characteristic to the individuals, while the uterine egg is being rotated slowly. Rough formation of the blotch pigment is generally terminated approximately 10 minutes or little more after the bulk deposition of pigment.

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