A Brief History Of Chickens
Galliformes, the order of bird that chickens belong to, is directly linked to the survival of birds when all other dinosaurs went extinct. Water or ground-dwelling fowl, similar to modern partridges, survived the Cretaceous–Paleogene extinction event that killed all tree-dwelling birds and dinosaurs. Some of these evolved into the modern galliformes, of which domesticated chickens are a main model.
Most scientists agree that the Southeast Asian Red Junglefowl (gallus gallus) is the primary wild ancestor of chickens. In a study published in 2020, it was found that chickens shared between 71% - 79% of their genome with red junglefowl, with the period of domestication dated to 8,000 years ago. However, because DNA studies show that the Red Junglefowl lacks the gene for yellow skin (and shanks) it is believed that some point, hybridization with the Grey Junglefowl (Gallus sonnaratii) of India has occurred. The body structure of the Indian Gamebird (Cornish) and the Brahmas of China gives physical evidence of Grey Jungle- fowl influence. The tail carriage of the breed Sumatra indicates genetic contributions of the SriLanka Junglefowl (Gallus lafayetti). No doubt the Green Junglefowl (Gallus varius) has also contributed to modern chickens.
The classification of today’s chicken (Gallus gallus domesticus) recognizes its primary origin, the Red Junglefowl. The Auracana, originally found in Auracania region of Chile continues to provide confusion. Some scientists believe that it was Pre-Columbian and originally from Polynesia. But DNA evidence disputes this theory.
Most scientists agree that the Southeast Asian Red Junglefowl (gallus gallus) is the primary wild ancestor of chickens. In a study published in 2020, it was found that chickens shared between 71% - 79% of their genome with red junglefowl, with the period of domestication dated to 8,000 years ago. However, because DNA studies show that the Red Junglefowl lacks the gene for yellow skin (and shanks) it is believed that some point, hybridization with the Grey Junglefowl (Gallus sonnaratii) of India has occurred. The body structure of the Indian Gamebird (Cornish) and the Brahmas of China gives physical evidence of Grey Jungle- fowl influence. The tail carriage of the breed Sumatra indicates genetic contributions of the SriLanka Junglefowl (Gallus lafayetti). No doubt the Green Junglefowl (Gallus varius) has also contributed to modern chickens.
The classification of today’s chicken (Gallus gallus domesticus) recognizes its primary origin, the Red Junglefowl. The Auracana, originally found in Auracania region of Chile continues to provide confusion. Some scientists believe that it was Pre-Columbian and originally from Polynesia. But DNA evidence disputes this theory.
Exactly when and where the chicken was domesticated remains a controversial issue. Domestication probably occurred 7,000-10,000 years ago in Southeast Asia and Oceana. Genomic studies estimate that the chicken was domesticated 8,000 years ago in Southeast Asia and spread to China and India 2,000 to 3,000 years later. Archaeological evidence supports domestic chickens in Southeast Asia well before 6000 BC, China by 6000 BC and India by 2000 BC.
Distribution of Chickens occurred rapidly and was widespread because of their ability to provide meat and eggs without being competitive for human food sources. However, it is believed that the sport of Cockfighting was the principle reason for dispersion of chickens.
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 and South Asia where they interbred with local wild species of junglefowl, forming genetically and geographically distinct groups. Analysis of the most popular commercial breed shows that the White Leghorn breed possesses a mosaic of divergent ancestries inherited from subspecies of red junglefowl.
Middle Eastern chicken remains go back to a little earlier than 2000 BC in Syria. They reached Egypt for purposes of cockfighting about 1400 BC and became widely bred in Egypt around 300 BC. Phoenicians spread chickens along the Mediterranean coasts as far as Iberia. During the Hellenistic period (4th–2nd centuries BC), in the southern Levant, chickens began to be widely domesticated for food. This change occurred at least 100 years before domestication of chickens spread to Europe.
Chickens reached Europe circa 100 BC. Breeding increased under the Roman Empire and reduced by the Middle Ages. Genetic sequencing of chicken bones from archaeological sites in Europe revealed that in the High Middle Ages chickens became less aggressive and began to lay eggs earlier in the breeding season.
An unusual variety of chicken that has its origins in South America is the Araucana, bred in southern Chile by the Mapuche people. Araucanas lay blue-green eggs. Additionally, some Araucanas are tailless, and some have tufts of feathers around their ears. It has long been suggested that they pre-date the arrival of European chickens brought by the Spanish and are evidence of pre-Columbian trans-Pacific contacts between Asian or Pacific Oceanic peoples, particularly the Polynesians, and South America. In 2007, an international team of researchers reported the results of their analysis of chicken bones found on the Arauco Peninsula in south-central Chile.
Radiocarbon dating suggested that the chickens were pre-Columbian, and DNA analysis showed that they were related to prehistoric populations of chickens in Polynesia. These results appeared to confirm that the chickens came from Polynesia and that there were transpacific contacts between Polynesia and South America before Columbus' arrival in the Americas
Distribution of Chickens occurred rapidly and was widespread because of their ability to provide meat and eggs without being competitive for human food sources. However, it is believed that the sport of Cockfighting was the principle reason for dispersion of chickens.
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 and South Asia where they interbred with local wild species of junglefowl, forming genetically and geographically distinct groups. Analysis of the most popular commercial breed shows that the White Leghorn breed possesses a mosaic of divergent ancestries inherited from subspecies of red junglefowl.
Middle Eastern chicken remains go back to a little earlier than 2000 BC in Syria. They reached Egypt for purposes of cockfighting about 1400 BC and became widely bred in Egypt around 300 BC. Phoenicians spread chickens along the Mediterranean coasts as far as Iberia. During the Hellenistic period (4th–2nd centuries BC), in the southern Levant, chickens began to be widely domesticated for food. This change occurred at least 100 years before domestication of chickens spread to Europe.
Chickens reached Europe circa 100 BC. Breeding increased under the Roman Empire and reduced by the Middle Ages. Genetic sequencing of chicken bones from archaeological sites in Europe revealed that in the High Middle Ages chickens became less aggressive and began to lay eggs earlier in the breeding season.
An unusual variety of chicken that has its origins in South America is the Araucana, bred in southern Chile by the Mapuche people. Araucanas lay blue-green eggs. Additionally, some Araucanas are tailless, and some have tufts of feathers around their ears. It has long been suggested that they pre-date the arrival of European chickens brought by the Spanish and are evidence of pre-Columbian trans-Pacific contacts between Asian or Pacific Oceanic peoples, particularly the Polynesians, and South America. In 2007, an international team of researchers reported the results of their analysis of chicken bones found on the Arauco Peninsula in south-central Chile.
Radiocarbon dating suggested that the chickens were pre-Columbian, and DNA analysis showed that they were related to prehistoric populations of chickens in Polynesia. These results appeared to confirm that the chickens came from Polynesia and that there were transpacific contacts between Polynesia and South America before Columbus' arrival in the Americas