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[48] [55] [56] A landmark 2020 Nature study that fully sequenced 863 chickens across the world suggests that all domestic chickens originate from a single domestication event of red junglefowl whose present-day distribution is predominantly in southwestern China, northern Thailand and Myanmar. These domesticated chickens spread across Southeast ...
Since then, the keeping of chickens has spread around the world for the production of food with the domestic fowl being a valuable source of both eggs and meat. [ 28 ] Since their domestication, a large number of breeds of chickens have been established, but with the exception of the white Leghorn , most commercial birds are of hybrid origin ...
Similarly, a 2020 study that analysed the whole genomes of Sri Lanka junglefowl, grey junglefowl, and green junglefowl found strong introgressive hybridisation events in different populations of indigenous village chickens. [2] The study also shows that 71–79% of red junglefowl DNA is shared with the domestic chicken. [2]
The domestic chicken is descended primarily from the red junglefowl (Gallus gallus) and is scientifically classified as the same species. [6] The traditional poultry farming view, is stated in Encyclopædia Britannica (2007): "Humans first domesticated chickens of Indian origin for the purpose of cockfighting in Asia, Africa
Location of origin Purposes Image Changes from wild ancestor/ Notes Extent in the wild vs. captivity Taxon group Domestic dog (Canis familiaris) [3] Extinct Pleistocene population of the grey wolf (Canis lupus ssp.) [4] 13,000 BCE [5] [6] China, [7] [8] [9] Europe [6] in different places in Asia
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]
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The Food and Agriculture Organization of the United Nations estimated that in 2002 there were nearly sixteen billion chickens in the world. [104] In 2008, the top countries with the highest number of chickens in the world was led by China with the largest at approx 4.6 billion, followed by the US with approx over 2 billion and then followed by ...