Chicken

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Chicken
Male and female chicken sitting together.jpg
Male (left) and female chickens
Domesticated
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Phasianidae
Genus: Gallus
Species:
G. g. domesticus
Binomial name
Gallus gallus domesticus
GLW 2 global distributions of c) chickens.tif
Chicken distribution
Synonyms

Gallus domesticus L.

The chicken (Gallus gallus domesticus) is a large and round short-winged bird, domesticated from the red junglefowl of Southeast Asia around 8,000 years ago. Most chickens are raised for food, providing meat and eggs; others are kept as pets or for cockfighting.

Contents

Chickens are common and widespread domestic animals, with a total population of 23.7 billion as of 2018, and an annual production of more than 50 billion birds. A hen bred for laying can produce over 300 eggs per year. There are numerous cultural references to chickens in folklore, religion, and literature.

Nomenclature

Terms for chickens include:

Chicken may mean a chick (as in Hen and Chicken Islands). [15] In older sources, and still often in trade and scientific contexts, chickens as a species are described as common fowl or domestic fowl. [16]

Description

Rooster portrait2.jpg
Comb of male
Hen Comb (cropped).jpg
Comb of female, generally smaller

Chickens are relatively large birds, active by day. The body is round, the legs are unfeathered in most breeds, and the wings are short. [17] Wild junglefowl can fly; chickens and their flight muscles are too heavy to allow them to fly more than a short distance. [18] Size and coloration vary widely between breeds. [17] Adult chickens of both sexes have a fleshy crest on their heads called a comb or cockscomb, and hanging flaps of skin on either side under their beaks called wattles; combs and wattles are more prominent in males. Some breeds have a mutation that causes extra feathering under the face, giving the appearance of a beard. [19]

Chickens are omnivores. [20] In the wild, they scratch at the soil to search for seeds, insects, and animals as large as lizards, small snakes, [21] and young mice. [22] A chicken may live for 5–10 years, depending on the breed. [23] The world's oldest known chicken lived for 16 years. [24]

Chickens are gregarious, living in flocks, and incubate eggs and raise young communally. Individual chickens dominate others, establishing a pecking order; dominant individuals take priority for access to food and nest sites. The concept of dominance, involving pecking, was described in female chickens by Thorleif Schjelderup-Ebbe in 1921 as the "pecking order". [25] [26] Male chickens tend to leap and use their claws in conflicts. [27] Chickens are capable of mobbing and killing a weak or inexperienced predator, such as a young fox. [28]

Crowing (with audio)

A male's crowing is a loud and sometimes shrill call, serving as a territorial signal to other males, [29] and in response to sudden disturbances within their surroundings. Hens cluck loudly after laying an egg and to call their chicks. Chickens give different warning calls to indicate that a predator is approaching from the air or on the ground. [30]

Reproduction and life-cycle

To initiate courting, some roosters may dance in a circle around or near a hen (a circle dance), often lowering the wing which is closest to the hen. [31] The dance triggers a response in the hen [31] and when she responds to his call, the rooster may mount the hen and proceed with the mating. Mating typically involves a sequence in which the male approaches the female and performs a waltzing display. If the female is unreceptive, she runs off; otherwise, she crouches, and the male mounts, treading with both feet on her back. After copulation the male does a tail-bending display. [32]

Sperm transfer occurs by cloacal contact between the male and female, in an action called the 'cloacal kiss'. [33] As with all birds, reproduction is controlled by a neuroendocrine system, the Gonadotropin-Releasing Hormone-I neurons in the hypothalamus. Reproductive hormones including estrogen, progesterone, and gonadotropins (luteinizing hormone and follicle-stimulating hormone) initiate and maintain sexual maturation changes. Reproduction declines with age, thought to be due to a decline in GnRH-I-N. [34]

Newly-hatched chicks Newly-hatched chickens.jpg
Newly-hatched chicks

Hens often try to lay in nests that already contain eggs and sometimes move eggs from neighbouring nests into their own. A flock thus uses only a few preferred locations, rather than having a different nest for every bird. [35] Under natural conditions, most birds lay only until a clutch is complete; they then incubate all the eggs. This is called "going broody". The hen sits on the nest, fluffing up or pecking defensively if disturbed. She rarely leaves the nest until the eggs have hatched. [36]

Eggs of chickens from the high-altitude region of Tibet have special physiological adaptations that result in a higher hatching rate in low oxygen environments. When eggs are placed in a hypoxic environment, chicken embryos from these populations express much more hemoglobin than embryos from other chicken populations. This hemoglobin has a greater affinity for oxygen, binding oxygen more readily. [37]

Fertile chicken eggs hatch at the end of the incubation period, about 21 days; the chick uses its egg tooth to break out of the shell. [31] Hens remain on the nest for about two days after the first chick hatches; during this time the newly hatched chicks feed by absorbing the internal yolk sac. [38] The hen guards her chicks and brood them to keep them warm. She leads them to food and water and calls them towards food. The chicks imprint on the hen and subsequently follow her continually. She continues to care for them until they are several weeks old. [39]

Origin and dispersal

Origin

Red junglefowl, the wild ancestor of the chicken Red Junglefowl.jpg
Red junglefowl, the wild ancestor of the chicken

Water or ground-dwelling fowl similar to modern partridges, in the Galliformes, the order of bird that chickens belong to, survived the Cretaceous–Paleogene extinction event that killed all tree-dwelling birds and their dinosaur relatives. [40] Chickens are descended primarily from the red junglefowl (Gallus gallus) and are scientifically classified as the same species. [41] Domesticated chickens freely interbreed with populations of red junglefowl. [41] The domestic chicken has subsequently hybridised with grey junglefowl, Sri Lankan junglefowl and green junglefowl; [42] a gene for yellow skin, for instance, was incorporated into domestic birds from the grey junglefowl (G. sonneratii). [43] It is estimated that chickens share between 71 and 79% of their genome with red junglefowl. [42]

Domestication

Chicken domestication and dispersal Chicken domestication and dispersal.svg
Chicken domestication and dispersal

According to one early study, a single domestication event of the red junglefowl in present-day Thailand gave rise to the modern chicken with minor transitions separating the modern breeds. [44] The red junglefowl is well adapted to take advantage of the vast quantities of seed produced during the end of the multi-decade bamboo seeding cycle, to boost its own reproduction. [45] In domesticating the chicken, humans took advantage of the red junglefowl's ability to reproduce prolifically when exposed to a surge in its food supply. [46]

Exactly when and where the chicken was domesticated remains controversial. Genomic studies estimate that the chicken was domesticated 8,000 years ago [42] 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. [42] [47] [48] 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. [49] [50] [51]

Dispersal

Map showing the prehistoric introduction of domesticated chickens into Oceania from the Philippines via the Neolithic Austronesian expansion (starting at c. 4000 BP), inferred from genetic markers on ancient and modern chicken DNA (Thomson et al., 2014) Map showing prehistoric diffusion of domestic chickens (Gallus gallus) into the Pacific via the Austronesian migrations (Thomson, Lebrasseur, & Austin, 2014).png
Map showing the prehistoric introduction of domesticated chickens into Oceania from the Philippines via the Neolithic Austronesian expansion (starting at c. 4000 BP), inferred from genetic markers on ancient and modern chicken DNA (Thomson et al., 2014)

A word for the domestic chicken (*manuk) is part of the reconstructed Proto-Austronesian language, indicating they were domesticated by the Austronesian peoples since ancient times. Chickens, together with dogs and pigs, were carried throughout the entire range of the prehistoric Austronesian maritime migrations to Island Southeast Asia, Micronesia, Island Melanesia, Polynesia, and Madagascar, starting from at least 3000 BC from Taiwan. [52] [53] [54] [55] These chickens might have been introduced during pre-Columbian times to South America via Polynesian seafarers, but evidence for this is still putative. [56]

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. [57] 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. [58] The first pictures of chickens in Europe are found on Corinthian pottery of the 7th century BC. [59] [60]

Breeding increased under the Roman Empire and reduced in the Middle Ages. [57] 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. [61]

Three possible routes of introduction into Africa around the early first millennium AD could have been through the Egyptian Nile Valley, the East Africa Roman-Greek or Indian trade, or from Carthage and the Berbers, across the Sahara. The earliest known remains are from Mali, Nubia, East Coast, and South Africa and date back to the middle of the first millennium AD. [57]

The possibility that domestic chickens were in the Americas before Western contact is debated by researchers, but blue-egged chickens, found only in the Americas and Asia, suggest an Asian origin for early American chickens. A lack of data from Thailand, Russia, the Indian subcontinent, Southeast Asia and Sub-Saharan Africa makes it difficult to lay out a clear map of the spread of chickens in these areas; better description and genetic analysis of local breeds threatened by extinction may also help with research into this area. [57] Chicken bones from the Arauco Peninsula in south-central Chile were radiocarbon dated as pre-Columbian, and DNA analysis suggested they were related to prehistoric populations in Polynesia. [62] [63] However, further study of the same bones cast doubt on the findings. [64] [65]

Diseases

8 day old chick with avian influenza Pesse oujheas H9N2 tanfla.JPG
8 day old chick with avian influenza

Chickens are susceptible both to parasites such as mites, and to diseases caused by pathogens such as bacteria and viruses. The parasite Dermanyssus gallinae feeds on blood, causing irritation and reducing egg production, and acts as a vector for bacterial diseases such as salmonellosis and spirochaetosis. [66] Viral diseases include avian influenza. [67]

Use by humans

Farming

Chickens are common and widespread domestic animals, with a total population of 23.7 billion as of 2018. [68] More than 50 billion chickens are reared annually as a source of meat and eggs. [69] In the United States alone, more than 8 billion chickens are slaughtered each year for meat, [70] and more than 300 million chickens are reared for egg production. [71] The vast majority of poultry is raised in factory farms. According to the Worldwatch Institute, 74% of the world's poultry meat and 68% of eggs are produced this way. [72] An alternative to intensive poultry farming is free-range farming. Friction between these two main methods has led to long-term issues of ethical consumerism. Opponents of intensive farming argue that it harms the environment, creates human health risks and is inhumane. [73] Advocates of intensive farming say that their efficient systems save land and food resources owing to increased productivity, and that the animals are looked after in a controlled environment. [74] Chickens farmed for meat are called broilers. Broiler breeds typically take less than six weeks to reach slaughter size, [75] some weeks longer for free range and organic broilers. [76]

A commercial chicken house with open sides raising broiler pullets for meat Florida chicken house.jpg
A commercial chicken house with open sides raising broiler pullets for meat

Chickens farmed primarily for eggs are called layer hens. The UK alone consumes more than 34 million eggs per day. [77] Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [78] After 12 months of laying, the commercial hen's egg-laying ability declines to the point where the flock is commercially unviable. Hens, particularly from battery cage systems, are sometimes infirm or have lost a significant amount of their feathers, and their life expectancy has been reduced from around seven years to less than two years. [79] In the UK and Europe, laying hens are then slaughtered and used in processed foods, or sold as 'soup hens'. [79] In some other countries, flocks are sometimes force moulted rather than being slaughtered to re-invigorate egg-laying. This involves complete withdrawal of food (and sometimes water) for 7–14 days [80] or sufficiently long to cause a body weight loss of 25 to 35%, [81] or up to 28 days under experimental conditions. [82] This stimulates the hen to lose her feathers but also re-invigorates egg-production. Some flocks may be force-moulted several times. In 2003, more than 75% of all flocks were moulted in the US. [83]

As pets

Keeping chickens as pets became increasingly popular in the 2000s [84] among urban and suburban residents. [85] Many people obtain chickens for their egg production but often name them and treat them as any other pet like cats or dogs. Chickens provide companionship and have individual personalities. While many do not cuddle much, they will eat from one's hand, jump onto one's lap, respond to and follow their handlers, as well as show affection. [86] [87] Chickens are social, inquisitive, intelligent [88] birds, and many people find their behaviour entertaining. [89] Certain breeds, such as silkies and many bantam varieties, are generally docile and are often recommended as good pets around children with disabilities. [90]

Cockfighting

A cockfight in Tamil Nadu, India, 2011 COCK FIGHT.JPG
A cockfight in Tamil Nadu, India, 2011

A cockfight is a contest held in a ring called a cockpit between two cocks. Cockfighting is outlawed in many countries as involving cruelty to animals. [91] The activity seems to have been practised in the Indus Valley civilisation from 2500–2100 BC. [92] In the process of domestication, chickens were apparently kept initially for cockfighting, and only later used for food. [93]

In science

Chickens have long been used as model organisms to study developing embryos. Large numbers of embryos can be provided commercially; fertilized eggs can easily be opened and used to observe the developing embryo. Equally important, embryologists can carry out experiments on such embryos, close the egg again and study the effects later in development. For instance, many important discoveries in limb development have been made using chicken embryos, such as the discovery of the apical ectodermal ridge and the zone of polarizing activity. [94]

The chicken was the first bird species to have its genome sequenced. [95] At 1.21 Gb, the chicken genome is similarly sized compared to other birds, but smaller than nearly all mammals: the human genome is 3.2 Gb. [96] The final gene set contained 26,640 genes (including noncoding genes and pseudogenes), with a total of 19,119 protein-coding genes, a similar number to the human genome. [97] In 2006, scientists researching the ancestry of birds switched on a chicken recessive gene, talpid2, and found that the embryo jaws initiated formation of teeth, like those found in ancient bird fossils. [98]

In culture, folklore, and religion

Chickens feature widely in folklore, religion, literature, and popular culture. The chicken is a sacred animal in many cultures and deeply embedded in belief systems and religious practices. [99] Roosters are sometimes used for divination, a practice called alectryomancy. This involves the sacrifice of a sacred rooster, often during a ritual cockfight, used as a form of communication with the gods. [100] In Gabriel García Márquez's Nobel-Prize-winning 1967 novel One Hundred Years Of Solitude , cockfighting is outlawed in the town of Macondo after the patriarch of the Buendia family murders his cockfighting rival and is haunted by the man's ghost. [101] Chicken jokes have been made at least since The Knickerbocker published one in 1847. [102] Chickens have featured in art in farmyard scenes such as Adriaen van Utrecht's 1646 Turkeys and Chickens and Walter Osborne's 1885 Feeding the Chickens. [103] The nursery rhyme "Cock a doodle doo", its chorus line imitating the cockerel's call, was published in Mother Goose's Melody in 1765. [104] The 2000 animated adventure comedy film Chicken Run , directed by Peter Lord and Nick Park, featured anthropomorphic chickens with many chicken jokes. [105] [106] [107]

Notes

  1. The surgical and chemical castration of chickens is now illegal in some parts of the world.

Related Research Articles

<span class="mw-page-title-main">Poultry</span> Domesticated birds kept by humans for their eggs, meat, or feathers

Poultry are domesticated birds kept by humans for the purpose of harvesting useful animal products such as meat, eggs or feathers. The practice of raising poultry is known as poultry farming. These birds are most typically members of the superorder Galloanserae (fowl), especially the order Galliformes. The term also includes waterfowls of the family Anatidae but does not include wild birds hunted for food known as game or quarry.

<span class="mw-page-title-main">Debeaking</span> Trimming of a birds beak, usually performed on domesticated birds

Debeaking, beak trimming, or beak conditioning is the partial removal of the beak of poultry, especially layer hens and turkeys although it may also be performed on quail and ducks. Most commonly, the beak is shortened permanently, although regrowth can occur. The trimmed lower beak is somewhat longer than the upper beak. A similar but separate practice, usually performed by an avian veterinarian or an experienced birdkeeper, involves clipping, filing or sanding the beaks of captive birds for health purposes – in order to correct or temporarily to alleviate overgrowths or deformities and better allow the bird to go about its normal feeding and preening activities. Amongst raptor-keepers, this practice is commonly known as "coping".

<span class="mw-page-title-main">Domestic turkey</span> Species of bird

The domestic turkey is a large fowl, one of the two species in the genus Meleagris and the same species as the wild turkey. Although turkey domestication was thought to have occurred in central Mesoamerica at least 2,000 years ago, recent research suggests a possible second domestication event in the area that is now the southwestern United States between 200 BC and 500 AD. However, all of the main domestic turkey varieties today descend from the turkey raised in central Mexico that was subsequently imported into Europe by the Spanish in the 16th century.

<span class="mw-page-title-main">Araucana</span> Breed of chicken

The Araucana is a breed of domestic chicken from Chile. Its name derives from the Araucanía region of Chile where it is believed to have originated. It lays blue-shelled eggs, one of very few breeds that do so.

<span class="mw-page-title-main">Red junglefowl</span> Species of bird; wild origin of the domesticated chicken

The red junglefowl is a tropical bird in the family Phasianidae. It ranges across much of Southeast Asia and parts of South Asia. It was formerly known as the bankiva or bankiva fowl. It is the species that gave rise to the chicken ; the grey junglefowl, Sri Lankan junglefowl and green junglefowl have also contributed genetic material to the gene pool of the chicken.

<span class="mw-page-title-main">Sri Lankan junglefowl</span> Species of bird

The Sri Lankan junglefowl, also known as the Ceylon junglefowl or Lafayette's junglefowl, is a member of the Galliformes bird order which is endemic to Sri Lanka, where it is the national bird. It is closely related to the red junglefowl, the wild junglefowl from which the chicken was domesticated. However, a whole-genome molecular study rather show that Sri Lankan junglefowl and grey junglefowl are genetically closer species than the red junglefowl. Sri Lankan junglefowl and red junglefowl diverged about 2.8 million years ago, whereas time of divergence between the Sri Lankan junglefowl and grey junglefowl was 1.8 million years ago.

<span class="mw-page-title-main">Broiler</span> Chicken bred for meat

Breed broiler is any chicken that is bred and raised specifically for meat production. Most commercial broilers reach slaughter weight between four and six weeks of age, although slower growing breeds reach slaughter weight at approximately 14 weeks of age. Typical broilers have white feathers and yellowish skin. Broiler or sometimes broiler-fryer is also used sometimes to refer specifically to younger chickens under 2.0 kilograms, as compared with the larger roasters.

<span class="mw-page-title-main">Grey junglefowl</span> Species of bird

The gray junglefowl, also known as Sonnerat's junglefowl, is one of the wild ancestors of the domestic chicken together with the red junglefowl and other junglefowls.

<span class="mw-page-title-main">Bekisar</span> Species of bird

The Bekisar, or Ayam Bekisar, is the first generation hybrid offspring of the green junglefowl and domesticated red junglefowl from Java. The roosters have a glossy blackish green plumage and are highly prized for their loud clear calls and striking colouration, while the hens are usually dull and infertile.

Gamebird hybrids are the result of crossing species of game birds, including ducks, with each other and with domestic poultry. These hybrid species may sometimes occur naturally in the wild or more commonly through the deliberate or inadvertent intervention of humans.

<span class="mw-page-title-main">Poultry farming</span> Part of animal husbandry

Poultry farming is the form of animal husbandry which raises domesticated birds such as chickens, ducks, turkeys and geese to produce meat or eggs for food. Poultry – mostly chickens – are farmed in great numbers. More than 60 billion chickens are killed for consumption annually. Chickens raised for eggs are known as layers, while chickens raised for meat are called broilers.

<span class="mw-page-title-main">Sebright chicken</span> British breed of bantam chicken

The Sebright is a British breed of bantam chicken. It is a true bantam – a miniature bird with no corresponding large version – and is one of the oldest recorded British bantam breeds. It is named after Sir John Saunders Sebright, who created it as an ornamental breed by selective breeding in the early nineteenth century.

Urban keeping of chickens as pets, for eggs, meat, or for eating pests is popular in urban and suburban areas. Some people sell the eggs for side income.

<span class="mw-page-title-main">Ayam Cemani</span> Breed of chicken

The Ayam Cemani is a rare breed of chicken from Indonesia. They have a dominant gene that causes hyperpigmentation (fibromelanosis), making the chicken mostly black, including feathers, beak, and internal organs. The Cemani is a very popular gamecock for cockfighting in Bali because their thighs have much more muscle compared to other chickens, which leads to them being much faster.

South and West Asia consists of a wide region extending from the present-day country of Turkey in the west to Bangladesh and India in the east.

<span class="mw-page-title-main">Poultry farming in Kenya</span> Part of the Kenyas agricultural economy

Poultry farming in Kenya is a widespread occupation. It is mostly practiced on a small-scale, and predominantly for domestic consumption.

<span class="mw-page-title-main">Cockfighting in India</span> Animal fighting game in India

Cockfighting in India primarily takes place in January, coinciding with Makara Sankranti. The practice is widespread in coastal districts of Andhra Pradesh, including Krishna, Guntur, East Godavari and West Godavari districts, despite being illegal in India.

<span class="mw-page-title-main">Gallus giganteus</span> A hypothetical species of fowl

Gallus giganteus or the Jago cock is a hypothetical species of fowl. It was first described in 1813 by Coenraad Jacob Temminck who named it on the basis of a large foot that he received, having a 5-centimetre (2.0 in) spur. Temminck thought it was a wild bird from southern Sumatra and western Java. Temminck assigned large domesticated species to the binomial Gallus patavinus used by Mathurin Jacques Brisson. It was again described by Leonard Fitzinger in 1878. The birds were described as being large with a comb that extended back in a line along the eye, thick, raised and appearing truncated on the top. The throat was bare and the wattles under the mandibles small. Later authors began to use the name Gallus giganteus for large domesticated species, including from Malabar, which was illustrated in Hardwicke's collection. Temminck believed that Gallus giganteus was one of six wild ancestors of the domestic chicken. Edward Blyth believed that domestic chickens were entirely derived by artificial selection of red junglefowl. Charles Darwin also favoured Blyth's hypothesis.

<span class="mw-page-title-main">Altsteirer</span> Chicken breed

Altsteirer, also known as the Styrian Hen and Chicken, Slovene: Štajerska kokoš or Štajerka, German: Altsteirer Huhn, is an autochthonous breed of domestic chicken originating in Slovenia and Austrian state Styria. The Styrian Hen is known as the only autochthonous (native) chicken breed of Slovenian area, with all other breeds being traditional at most, hence introduced in the past and consequently adapted to country's conditions. The Altsteirer's set of traits suggests the breed may share a common descent with other Mediterranean chicken breeds.

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