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Guinea pig breed : ウィキペディア英語版
List of guinea pig breeds

There are many breeds of guinea pig or cavy which have been developed since its domestication ca. 5000 BC. Breeds vary widely in appearance and purpose, ranging from show breeds with long, flowing hair to those in use as model organisms by science. From ca. 1200 AD to the Spanish conquest of the Inca Empire in 1532, selective breeding by indigenous South American people resulted in many landrace varieties of domestic guinea pigs, which form the basis for some of the modern, formal breeds. Early Andean varieties were primarily kept as agricultural stock for food, and efforts at improving the guinea pig as a food source continue to the modern era.
With the export of guinea pigs to Europe in the 15th century, the goal in breeding shifted to focus on the development of appealing pets. To this end, various competitive breeding organizations were founded by fanciers. The American Cavy Breeders Association, an adjunct to the American Rabbit Breeders Association, is the governing body in the United States and Canada. The British Cavy Council governs cavy clubs in the United Kingdom. Similar organizations exist in Australia (Australian National Cavy Council)〔(【引用サイトリンク】 Official Website )〕 and New Zealand (Combined Cavy Clubs New Zealand). Each club publishes its own Standard of Perfection and determines which breeds are eligible for showing. New breeds continue to emerge in the 21st century.
Though there are many breeds of guinea pig, only a few breeds are commonly found on the show table as pets. Most guinea pigs found as pets were either found undesirable by breeders or were bred to be pleasant pets regardless of how well they meet the breed standard of perfection. The English/American Short-haired, the Abyssinian (rough-coated), the Peruvian (long-coated), and the Sheltie (a.k.a. Silkie, long-coated) breeds are those most frequently seen as pets, and the former three are the core breeds in the history of the competitive showing of guinea pigs. In addition to their standard form, nearly all breeds come in a Satin variant. Satins, due to their hollow hair shafts, possess coats of a special gloss and shine. However, there is growing evidence that the genes responsible for the satin coat also can cause severe bone problems, including osteodystrophy and Paget's disease.〔Jordan, Julia. ("Untersuchungen zur Osteodystrophia fibrosa beim Hausmeerschweinchen" (''Cavia aperea'' f. ''porcellus'') der Züchtung ‚satin‘ " ) 'Investigation of Osteodystrophia Fibrosa in Guinea Pigs (''Cavia aperea'' f. ''porcellus'') the "Satin" phenotype'. Dissertation, Freie Universität Berlin, 2006. ISBN 978-3-86664-349-9〕 Showing satin variations is prohibited by some cavy breeders' associations because of animal welfare reasons.
All cavy breeds have some shared general standards: the head profile should be rounded, with large eyes and large, smooth ears. The body should be strong and of compact build. Coat colour should in all variations be clearly defined and thorough from root to tip. These standards are best met by long established, commonly bred breeds, as their breeders have had enough time and animals to effectively breed for these qualities. The coat colour ideal of good definition and thoroughness is rarely met by other than the smooth-coated breeds, which have had well established, separate breeding lines for different colours.
== American ==

The most common cavy breed, the American cavy is a recognized breed by ARBA. They are to be entered and shown by ARBA in nineteen color classifications; Black, Cream, Red, White, Any Other Self (Beige, Chocolate, Lilac, Red-Eyed Orange), Brindle, Roan, Dilute Solid, Golden Solid, Silver Solid, Dilute Agouti, Golden Agouti, Silver Agouti, Dalmatian, Dutch, Himalayan, Tortoise Shell & White, Any Other Marked (Broken Color and Tortoise Shell), and Tan Pattern (Black Tan, Blue Tan, Chocolate Tan, Beige Tan, and Lilac Tan). The American is to be posed with the hind feet under the animal and the front feet slightly ahead of the shoulders, and should not be forced into a cobby position or stretched out.
The American is to have a broad shoulder, roman nose, and full crown, and the coat is to be short and silky. The coat should be faulted for feathering, harshness, or a thin or long coat. Disqualify for ridges, rosettes, side whiskers, or a Satin sheen, not to be confused with the natural luster of some varieties. The ears are to be drooping but not fallen, and the eyes are to be bold and bright.
The American is known for its sweet and docile personality, and is considered by many an excellent breed of cavy for new owners.

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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