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domestic goose : ウィキペディア英語版
domestic goose

Domestic geese (''Anser anser domesticus'' or ''Anser cygnoides'') are domesticated grey geese (either greylag geese or swan geese) kept as poultry for their meat, eggs, and down feathers since ancient times.
==Origins and characteristics==

In Europe, northern Africa, and western Asia, the original domesticated geese are derived from the greylag goose ''Anser anser''. In eastern Asia, the original domesticated geese are derived from the swan goose ''Anser cygnoides''; these are commonly known as Chinese geese. Both have been widely introduced in more recent times, and modern flocks in both areas (and elsewhere, such as Australia and North America) may consist of either species, and/or hybrids between them. Chinese geese may be readily distinguished from European geese by the large knob at the base of the bill, though hybrids may exhibit every degree of variation between them.〔Buckland, R., & Guy, G. (2002). ''Goose Production''. Chapter 1: (Origins and Breeds of Domestic Geese ). FAO Agriculture Department.〕
The domestication, as Charles Darwin remarks (''The Variation of Animals and Plants under Domestication'' i. 287), is of very ancient date, with archaeological evidence for domesticated geese in Egypt more than 4,000 years ago.〔Hugo, S. (undated). (Geese: the underestimated species ). FAO Agriculture Department.〕 They are much larger, and they have been selected for that larger size, with domesticated breeds weighing up to ,〔 compared to the maximum of for the wild swan goose and for the wild greylag goose.〔del Hoyo, J., Elliott, A., & Sargatal, J., eds. ''Handbook of Birds of the World'' Vol. 1: 581. Lynx Edicions, Barcelona. ISBN 84-87334-10-5〕 This affects their body structure; whereas wild geese have a horizontal posture and slim rear end, domesticated geese lay down large fat deposits toward the tail end, giving a fat rear and forcing the bird into a more upright posture. This also prevents flight for most domestic geese, though geese will run and flap their wings when startled, and may get a foot or so in the air momentarily.
They have also been strongly selected for fecundity, with females laying up to 50 eggs per year, compared to 5–12 eggs for a wild goose.〔〔
Changes to the plumage are variable; many have been selected to lose dark brown tones of the wild bird. The result is an animal marked, or completely covered in white feathers. Others retain plumage close to the natural; some, such as the modern Toulouse goose look almost identical to the greylag in plumage, differing only in structure. White geese are often preferred as they look better plucked and dressed, with any small down feathers remaining being less conspicuous. From the time of the Romans, white geese have been held in great esteem.
Geese produce large edible eggs, weighing .〔 They can be used in cooking just like chicken's eggs, though they have proportionally more yolk, and this cooks to a slightly denser consistency. The taste is much the same as that of a chicken egg, but more gamey.
Because geese have a loud call and are sensitive to unusual movements, they can contribute towards the security of a property. In late 1950s South Vietnam, the VNAF used flocks of geese to guard their parked aircraft at night due to the noise they would make at intruders.〔Grandolini, A. ''Indo-Chinese Fighting ' Cats: Grumman's Superb Bearcat in Vietnam'' Air Enthusiast magazine article July-August 1997 No.70 p.17〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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