Emily Carter
The chicken, or *Gallus gallus domesticus*, is a domesticated subspecies of the red junglefowl (*Gallus gallus*). It is believed that the chicken was first domesticated around 8,000 years ago, though some estimates place this figure at 7,000 or 10,000 years ago. In the 20th century, chickens were still largely a minor part of the American diet and economy, and meat production was secondary to egg production. However, the advent of large-scale industrial production in the 20th century changed this, and the economic and nutritional contribution of chickens increased. This marked the beginning of factory farming, with chickens becoming a protein-producing commodity.
| Characteristics | Values |
|---|---|
| Scientific name | Gallus gallus domesticus |
| Common name | Chicken, common fowl, domestic fowl |
| Origin | Southeast Asia and Oceana |
| Primary wild ancestor | Red Junglefowl (Gallus gallus) |
| Other possible ancestors | Grey Junglefowl (Gallus sonneratii), Green Junglefowl (Gallus varius), Sri Lanka Junglefowl (Gallus lafayetti) |
| Date of first domestication | 7,000-10,000 years ago |
| Other possible dates of domestication | 8,000-11,000 years ago, 2,000 BC |
| Uses | Meat, eggs, pets, cockfighting, religion, art, science, literature, folklore |
| Global population | 26.5 billion |
| Number produced annually for consumption | 50 billion |
| Weight | 2.6 kg (5.7 lbs) on average |
| Number of eggs laid per year | 300+ |
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What You'll Learn
The chicken's scientific name
Chickens have been widespread throughout southern Central Asia since the 4th century BC. They were first domesticated around 8,000 years ago and have become one of the most common and widespread domesticated animals in the world. The global chicken population exceeds 26.5 billion, with more than 50 billion birds produced annually for consumption.
There is some debate about what the chicken's scientific name should be. While many taxonomists and ornithologists consider it a domesticated form of the wild red junglefowl, some classify it as a subspecies of the red junglefowl (*i.e.*, *G. gallus domesticus*), and others, including the U.S. Department of Agriculture, classify the bird as *G. domesticus*.
Chickens have been featured in art, literature, and religion for centuries. They were first introduced to the New World by Polynesians who reached the Pacific coast of South America before the voyages of Columbus. In the 20th century, chickens played a relatively minor role in the American diet and economy, but with the advent of large-scale industrial production, they became a central component of global animal husbandry and agriculture.
The breakthrough that made today's massive chicken farms possible was the fortification of feed with antibiotics and vitamins, which allowed chickens to be raised indoors. Factory farming represents the chicken's final step in its transformation into a protein-producing commodity.
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Domestication history
The chicken, scientifically known as *Gallus gallus domesticus*, is a domesticated subspecies of the red junglefowl (*Gallus gallus*), which is native to Southeast Asia. The chicken was first domesticated around 7,000 to 10,000 years ago and has since become one of the most common and widespread domesticated animals worldwide.
Early History
The exact timing and location of chicken domestication are still debated, but genomic studies indicate that it occurred approximately 8,000 years ago in Southeast Asia, specifically in present-day Thailand, southwestern China, and Myanmar. Archaeological evidence supports the presence of domestic chickens in Southeast Asia before 6000 BC, China by 6000 BC, and India by 2000 BC.
Chickens gradually spread across the world, reaching the Middle East by around 2000 BC, as evidenced by remains found in Syria. By the 4th century BC, they were widespread throughout southern Central Asia, and the Phoenicians introduced them along the Mediterranean coasts as far as Iberia. During the Hellenistic period (4th–2nd centuries BC), chickens began to be widely domesticated for food in the southern Levant. The first depictions of chickens in Europe appear on Corinthian pottery from the 7th century BC.
Modern Developments
Breeding practices intensified under the Roman Empire but declined during the Middle Ages. In the post-Roman period, chicken sizes returned to their Iron Age dimensions, and other poultry, such as geese and partridge, became more prevalent in medieval cuisine.
While chickens have long been valued for cockfighting, egg production, and meat, their economic and nutritional significance remained modest until the advent of large-scale industrial production in the 20th century. The breakthrough that enabled today's massive chicken farms was the fortification of feed with antibiotics and vitamins, allowing chickens to be raised indoors. This marked the transition to factory farming, where chickens are primarily viewed as protein-producing commodities.
Selective breeding has also played a significant role in shaping modern chicken breeds. In 1874, the American Poultry Association published the first "Standard of Excellence," outlining breed characteristics and initiating the Golden Age of Pure Breeding. Heavy breeds like the Brahma and light breeds such as the Minorca, Leghorn, and Ancona were developed for specific traits, leading the way for all livestock species.
Today, hybridisation has further enhanced egg production, with modern hybrids surpassing pure breeds in both egg yield and feed efficiency. These hybrids can produce over 300 eggs per year, contributing to an annual global production of more than 50 billion birds for consumption.
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Industrial production
Chickens have been domesticated for around 8,000 years, but it was not until the advent of large-scale industrial production in the 20th century that they became a central component of the global economy and diet.
The industrialization of chicken production was a gradual process that began with the development of the “broiler” in the early 20th century—a chicken raised specifically for its meat. Broiler production was initiated in several regions of the United States, including the Delmarva Peninsula, Georgia, Arkansas, and New England. These regions offered favorable weather conditions, adequate land and water, and access to corn and soybeans, which are essential for poultry feed.
Mrs. Cecile (or Wilmer) Long Steele of Sussex County, Delaware, is often credited as the pioneer of the commercial broiler industry. In 1923, she raised a flock of 500 chicks for meat production, and by 1926, she had expanded her operation to accommodate 10,000 birds. This marked the beginning of centralized, mechanized chicken farming, which would soon spread across the nation.
By the 1940s, entrepreneurs began consolidating feed mills, hatcheries, and processing operations, leading to the integration of the industry. This vertical integration allowed for greater efficiency, responsiveness, and profitability. The National Broiler Council (NBC), formed in 1954, played a crucial role in stimulating consumer demand and promoting chicken as "the food of the future."
The breakthrough that enabled the industrialization of chicken farming was the fortification of feed with antibiotics and vitamins. This innovation allowed chickens to be raised indoors, sheltered from weather and predators, and fed a controlled diet optimized for growth. The indoor farming of chickens, often in crowded conditions, became known as "factory farming."
By the mid-1960s, 90% of broilers produced in the United States came from integrated operations. The industry continued to evolve, incorporating nutritional discoveries, disease eradication programs, genetic improvements, and mechanization technologies. By the mid-1970s, the modern chicken industry had largely taken shape, supplying affordable, nutritious, and high-quality products to consumers nationwide and globally.
Today, the chicken industry is a highly efficient, vertically integrated enterprise. In the United States, the National Chicken Council represents companies that account for approximately 95% of broiler chicken production. Globally, more than 50 billion chickens are produced annually for consumption, with specialized breeds developed for meat and egg production. The industrialization of chicken production has transformed this domesticated fowl into a protein-producing commodity, contributing significantly to the world's food supply.
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Cultural significance
Chickens have played a significant role in human culture for centuries. They are a central component of global animal husbandry and agriculture, and are one of the most widely raised animals in the world, with over 50 billion birds produced annually for consumption. They are kept for their meat and eggs, as well as for companionship.
Chickens feature in folklore, religion, and literature across many societies. They are a sacred animal in many cultures and are deeply embedded in belief systems and religious practices. For example, in some cultures, chickens are believed to be messengers between the living and the dead, or symbols of the sun. Roosters are sometimes used for divination, a practice called alectryomancy, which involves the sacrifice of a sacred rooster during a ritual cockfight, used as a form of communication with the gods. In Santería, a religion that originated in Cuba, chickens are ritually sacrificed. In Buddhism, cocks are depicted as a symbol of greed in Tibetan murals, and in ancient Greece, they were associated with valour and depicted as an attribute of Ares, Heracles, and Athena. In the Gospel, a rooster plays a small but crucial role in helping to fulfill the prophecy that Peter would deny Jesus before the cock crows. In some parts of Asia, it is customary to give a chicken as a gift to newlyweds as a symbol of fertility and abundance.
Chickens have also been a source of inspiration for artists and writers throughout history, from colourful roosters in Chinese paintings to mischievous hens in Beatrix Potter’s children’s books. They have appeared in songs and music videos, such as "Surfin’ Bird" by The Trashmen and Beyoncé's "Formation". They have also become internet sensations, with videos of chickens playing musical instruments and solving puzzles.
Chickens have been present in art for centuries, with pictures of chickens found on ancient Greek pottery and Etruscan askos from the 4th century BC. They have also been featured in farmyard scenes by artists such as Adriaen van Utrecht and Walter Osborne. In the post-Roman period, the size of chickens returned to what they were during the Iron Age, and they became less common on medieval tables, with other fowls like geese and partridge taking their place. In the 19th and 20th centuries, chickens were valued in the West primarily as a source of eggs, and their economic and nutritional contribution was modest until the advent of large-scale industrial production in the 20th century. The breakthrough that made today's massive chicken farms possible was the fortification of feed with antibiotics and vitamins, which allowed chickens to be raised indoors.
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Subspecies and ancestry
The chicken, or *Gallus gallus domesticus*, is a domesticated subspecies of the red junglefowl (*Gallus gallus*), originally native to Southeast Asia. It is believed that the chicken was first domesticated around 8,000 years ago and has since become one of the most common and widespread domesticated animals in the world.
The red junglefowl is widely recognised as the primary ancestor of the domestic chicken. However, molecular studies have revealed that other species of junglefowl, including the grey junglefowl (*Gallus sonneratii*), Sri Lankan junglefowl (*Gallus lafayettii*), and green junglefowl (*Gallus varius*), have also contributed genetic material to the gene pool of the modern chicken. These findings suggest that hybridisation and introgression have played key roles in the evolutionary history of the chicken species.
The classification of the chicken as a domesticated subspecies of the red junglefowl recognises its primary origin in the red junglefowl. Domestication likely occurred between 7,000 and 10,000 years ago in Southeast Asia and Oceania. Archaeological evidence supports the presence of domestic chickens in Southeast Asia well before 6000 BC, in China by 6000 BC, and in India by 2000 BC.
The spread of chickens across the world can be attributed to various factors. During the Hellenistic period (4th–2nd centuries BC), chickens began to be widely domesticated for food in the southern Levant. Phoenicians contributed to the spread of chickens along the Mediterranean coasts as far as Iberia. By the 4th century BC, chickens were widespread throughout southern Central Asia. Chickens were also among the ancestral domesticated animals of the Austronesian peoples, who carried them to the islands of Oceania starting around 5,000 years ago.
In the 19th and 20th centuries, selective breeding practices and the advent of large-scale industrial production transformed the economic and nutritional significance of chickens. The American Poultry Association published the first "Standard of Excellence" outlining breed characteristics in 1874. The Golden Age of Pure Breeding saw the development of specialised breeds for meat and egg production, such as broilers and laying hens. The fortification of feed with antibiotics and vitamins enabled chickens to be raised indoors, leading to the emergence of factory farming and the rise of chickens as a central component of global animal husbandry and agriculture.
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Frequently asked questions
The chicken's scientific name is Gallus gallus domesticus. It is a domesticated subspecies of the red junglefowl (Gallus gallus), originally native to Southeast Asia.
Chickens were first domesticated around 7,000 to 10,000 years ago, although some estimates place this figure at 8,000 years. They were likely first domesticated in Thailand or peninsular Southeast Asia.
Archaeological evidence, historical texts, and artwork all provide insights into the domestication of chickens. Chicken remains, depictions in prehistoric art across Central Asia, and mentions in texts from the last few centuries BC indicate the presence of chickens in ancient societies.
The large-scale industrial production of chickens in the 20th century contributed to their increased role as a food source. The fortification of feed with antibiotics and vitamins enabled chickens to be raised indoors, leading to the development of factory farming and their widespread consumption.
