| 翻訳と辞書 |
| Solid white (chicken plumage) ： ウィキペディア英語版 |
Solid white (chicken plumage)
In poultry standards, solid white is coloration of plumage in chickens (''Gallus gallus domesticus'') characterized by a uniform pure white color across all feathers, which is not generally associated with depigmentation in any other part of the body.
Color is an important feature of most living organisms. In the wild, color has great significance affecting the survival and reproductive success of the species. The environmental constraints which lead to the specific colors of birds and animals are very strong and individuals of novel colors tend not to survive. Under domestication, mankind has transformed all the species involved which have thus been freed from environmental pressures to a large extent. Early color variants were mostly selected for utility reasons or religious practices. In more recent centuries color varieties have been created purely for ornament and pleasure, fashion playing a surprisingly large part in their development. A bewildering array of colors and patterns can now be found in the domestic fowl.〔Sheppy, A. 2011 ''The colour of domestication and the designer chicken''. Optics & Laser Technology Volume 43, Issue 2, pp. 295–301.〕 In the last decades white plumage color has become essential for the efficient processing of broilers and most types of meat-type poultry. Slaughterhouses and meat processing plants require poultry with a white or very light undercolor to produce carcasses without the typical "hair", which colored chickens have, that necessitates singeing after plucking.
There are several chicken breeds having solid white as the most typical plumage color, such as Leghorn, Dorking, Polish, Wyandotte and others. And there are many other breeds better known by their colored varieties, which also have a solid white variety, such as Plymouth Rock, Orpington, Rhode Island Red, Jersey Giant and others.〔Hutt, F.B. ''Genetics of the fowl''. McGraw-Hill Book Co. N.Y. 1949.〕〔Somes, R. G. ''International Registry of Poultry Genetic Stocks. A Directory of Specialized Lines and Strains, Mutations, Breeds and Varieties of Chickens, Japanese Quail and Turkeys''. Storrs Agricultural Experiment Station, The University of Connecticut, Storrs, Bulletin #460, (1981).〕
==Description==
Chicks down color of solid white chicken breeds can vary from a light creamy white, through different yellow shades, to a toasted orange.〔 In adult phase, the entire surface of the plumage is pure white due to the absence of melanin pigmentation in all parts of the feathers. The absence of melanin in the plumage of solid white chicken breeds does not affect other body structures, except in the case of the albinos, which are easily recognized by their pink eye color.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Solid white (chicken plumage)」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|