There are hundreds of chicken breeds in existence.[1] Domesticated for thousands of years, distinguishable breeds of chicken have been present since the combined factors of geographical isolation and selection for desired characteristics created regional types with distinct physical and behavioral traits passed on to their offspring.[2]
The physical traits used to distinguish chicken breeds are size, plumage color, comb type, skin color, number of toes, amount of feathering, egg color, and place of origin.[1] They are also roughly divided by primary use, whether for eggs, meat, or ornamental purposes, and with some considered to be dual-purpose.[1]
In the 21st century, chickens are frequently bred according to predetermined breed standards set down by governing organizations. The first of such standards was the British Poultry Standard, which is still in publication today.[3][4] Other standards include the Standard of Perfection, the Australian Poultry Standard, and the standard of the American Bantam Association, which deals exclusively with bantamfowl.[4] Only some of the known breeds are included in these publications, and only those breeds are eligible to be shown competitively. There are additionally a few hybrid strains which are common in the poultry world, especially in large poultry farms. These types are first generation crosses of true breeds. Hybrids do not reliably pass on their features to their offspring, but are highly valued for their producing abilities.[1]
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By place of origin: Afghanistan • Albania • Australia • Austria • Belgium • Bulgaria • Canada •Chile • China • Croatia • Cuba • Czech Republic • Egypt • Finland • France • Germany • Greece• Iceland • India • Indonesia • Iran • Italy • Japan • Korea • Kosovo • Malaysia • Myanmar •Netherlands • Norway • Pakistan • Philippines • Poland • Portugal • Romania • Russia • Serbia •Slovakia • South Africa • Spain • Sweden • Switzerland • Thailand • Turkey • Ukraine • United Kingdom • United States • Vietnam
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By place of origin
Afghanistan
Albania
Australia
Austria
Belgium
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Bulgaria
Canada
Chile
China
Croatia
Cuba
Cyprus
Czech Republic
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Egypt
Finland
France
Germany
Large breeds
Greece
Iceland
India
Indonesia
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Iran
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Italy
Japan
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Korea
Kosovo
Malaysia
Marianas
Myanmar
Netherlands
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Norway
Pakistan
Philippines
See also: List of native Philippine chicken breeds
Poland
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Portugal
Romania
Russia
Serbia
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Slovakia
South Africa
Spain
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Sweden
Switzerland
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Thailand
Turkey
Ukraine
United Kingdom
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United States of America
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