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From Wikipedia, the free encyclopedia

Chicken
A rooster (left) and hen (right)
Conservation status
Domesticated
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Phasianidae
Genus: Gallus
Species: Gallus gallus
Subspecies: Gallus gallus domesticus
(Linnaeus, 1758)

Synonyms

Chicken : Rooster (m), Hen (f)

The chicken (Gallus gallus domesticus) is a domesticated fowl. As one of the most common and widespread domestic animals, and with a population of more than 24 billion in 2003,[1] there are more chickens in the world than any other bird. Humans keep chickens primarily as a source of food, consuming both their meat and their eggs.

Conventional wisdom has held that the chicken was domesticated in India,[2] but recent evidence suggests that domestication of the chicken was already under way in Vietnam over 10,000 years ago.[2] From India the domesticated fowl made its way to the Persianized kingdom of Lydia in western Asia Minor, domestic fowl were imported to Greece by the fifth century BC.[3] Fowl had been known in Egypt since the 18th Dynasty, with the "bird that lays every day" having come to Egypt from the land between Syria and Shinar, Babylonia, according to the annals of Tutmose III.[4]

The chicken is believed to have descended from both the Red Junglefowl (Gallus gallus) and the Grey Junglefowl (G. sonneratii), though hybrids of both wild types usually tend to be sterile. Recent genetic work has revealed that the genotype for yellow skin present in the domestic fowl is not present in what is otherwise its closest kin, the Red Junglefowl. It is most likely that the yellow skin trait in domestic birds originated in the Grey Junglefowl.[5]

Contents

Terminology

In the UK and Canada adult male chickens are known as cocks whereas in America and Australia they are called roosters. Males under a year old are cockerels.[6] Castrated roosters are called capons (though both surgical and chemical castration are now illegal in some parts of the world). Females over a year old are known as hens, and younger females are pullets.[7] In Australia and New Zealand (also sometimes in Britain), there is a generic term chook (pronounced /ˈtʃʊk/: rhymes with "book") to describe all ages and both sexes.[8] Babies are called chicks, and the meat is called chicken.

"Chicken" was originally the word only for chicks, and the species as a whole was then called domestic fowl, or just fowl. This use of "chicken" survives in the phrase "Hen and Chickens", sometimes used as a British public house or theatre name, and to name groups of one large and many small rocks or islands in the sea (see for example Hen and Chicken Islands).

General biology and habitat

Chickens are omnivores.[9] In the wild, they often scratch at the soil to search for seeds, insects and even larger animals such as lizards or young mice[10].

Chickens may live for five to eleven years, depending on the breed.[11] In commercial intensive farming, a meat chicken generally lives only six weeks before slaughter.[12] A free range or organic meat chicken will usually be slaughtered at about 14 weeks. Hens of special laying breeds may produce as many as 300 eggs a year. After 12 months, the hen's egg-laying ability starts to decline, and commercial laying hens are then slaughtered and used in baby foods, pet foods, pies and other processed foods.[13] The world's oldest chicken, according to the Guinness Book of World Records, died of heart failure when she was 16 years old.[14]

The adult rooster can be distinguished from the hen by its comb

Roosters can usually be differentiated from hens by their striking plumage, marked by long flowing tails and shiny, pointed feathers on their necks and backs (the hackles and saddle)—these are often colored differently from the hackles and saddles of females.

However, in some breeds, such as the Sebright, the cock has only slightly pointed neck feathers, the same colour as the hen's. The identification must be made by looking at the comb, or eventually from the development of spurs on the male's legs (in a few breeds and in certain hybrids the male and female chicks may be differentiated by colour). Adult chickens have a fleshy crest on their heads called a comb or cockscomb, and hanging flaps of skin either side under their beaks called wattles. Both the adult male and female have wattles and combs, but in most breeds these are more prominent in males.

A muff or beard is a mutation found in several chicken breeds which causes extra feathering under the chicken's face, giving the appearance of a beard.

Wild Red Junglefowl- Male at 23 Mile near Jayanti in Buxa Tiger Reserve in Jalpaiguri district of West Bengal, India.

Domestic chickens are not capable of long distance flight, although lighter birds are generally capable of flying for short distances, such as over fences or into trees (where they would naturally roost). Chickens will sometimes fly to explore their surroundings, but usually do so only to flee perceived danger.

Chickens are gregarious birds and live together as a flock. They have a communal approach to the incubation of eggs and raising of young. Individual chickens in a flock will dominate others, establishing a "pecking order", with dominant individuals having priority for access to food and nesting locations. Removing hens or roosters from a flock causes a temporary disruption to this social order until a new pecking order is established. Adding hens—especially younger birds—to an existing flock, can lead to violence and injury.[15]

Hens will try to lay in nests that already contain eggs, and have been known to move eggs from neighbouring nests into their own. Some farmers use fake eggs made from plastic or stone (or golf balls) to encourage hens to lay in a particular location. The result of this behavior is that a flock will use only a few preferred locations, rather than having a different nest for every bird.

Hens can also be extremely stubborn about always laying in the same location. It is not unknown for two (or more) hens to try to share the same nest at the same time. If the nest is small, or one of the hens is particularly determined, this may result in chickens trying to lay on top of each other.

Skull of a chicken three weeks old. Here the opisthotic bone appears in the occipital region, as in the adult Chelonian. bo = Basi-occipital, bt = Basi-temporal, eo = Opisthotic, f = Frontal, fm = Foramen magnum, fo = Fontanella, oc = Occipital condyle, op = Opisthotic, p = Parietal, pf = Post-frontal, sc = Sinus canal in supra-occipital, so = Supra-occpital, sq = Squamosal, 8 = Exit of vagus nerve.

Roosters crowing (a loud and sometimes shrill call) is a territorial signal to other roosters. However, crowing may also result from sudden disturbances within their surroundings. Hens cluck loudly after laying an egg, and also to call their chicks.

In 2006, scientists researching the ancestry of birds "turned on" a chicken recessive gene, talpid2, and found that the embryo jaws initiated formation of teeth, like those found in ancient bird fossils. John Fallon, the overseer of the project, stated that chickens have "...retained the ability to make teeth, under certain conditions..."[16]

Courting

When a rooster finds food, he may call the other chickens to eat it first. He does this by clucking in a high pitch as well as picking up and dropping the food. This behavior can also be observed in mother hens, calling their chicks. In some cases the rooster will drag the wing opposite the hen on the ground, while circling her. This is part of chicken courting ritual and has been called a "dance".[17] The dance triggers a response in the hen's brain,[17] and when the hen responds to his "call", the rooster may mount the hen and proceed with the fertilization.

Breeding

Origins

Formerly, phenotypic diversity of modern chickens led to a belief of polyphyletic origins.[18] According to genetic researchers, all modern chicken genes can be derived from the subspecies of Gallus found in northeast Thailand.[19][20] This is supported by archaeological findings. Researchers have found chickens' bones in unusual amounts and out of natural jungle range, thus denoting a breeding place. Bones of domestic chickens have been found about 6000-4000 BC in Yangshao and Peiligan, China, while the Holocene climate was not naturally suitable for the Gallus species.[21] Archaeological data is lacking for Thailand and southeast Asia.

Later traces are found about 3000-2000 BC in Harappa and Mohenjo-Daro, Pakistan,[22] and -according to linguistic researchers- in Austronesian populations traveling across southeast Asia and Oceania. A northern road spread chicken to the Tarim basin of central Asia, modern day Iran. The chicken reached Europe (Romania, Turkey, Greece, Urkraine) about 3000BC, and the Indus Valley about 2500 BC.[19] Introduction into Western Europe came far later, about the 1st millennium BC. Phoenicians spread chickens along the Mediterranean coasts, to Iberia. Breeding increased under the Roman Empire, and was reduced in the Middle Ages.[19] Middle East traces of chicken go back to a little earlier than 2000 BC, in Syria; chicken went southward only in the 1st millennium BC. The chicken reached Egypt for purposes of cock fighting about 1400BC, and became widely bred only in Ptolemaic Egypt (about 300 BC).[19] Little is known about the chicken's introduction into Africa. Three possible ways of introduction in about 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.[19] Domestic chicken in the Americas before Western conquest is still an ongoing discussion, but blue-egged chicken, found only in the Americas and Asia, suggest an Asian origin for early American chickens.[19]

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.[19]

Current

Chicken eggs vary in color depending on the hen, typically ranging from bright white to shades of brown and even blue, green, and recently reported purple (found in South Asia) (Araucana varieties).

Under natural conditions, most birds lay only until a clutch is complete, and they will then incubate all the eggs. Many domestic hens will also do this–and are then said to "go broody". The broody hen will stop laying and instead will focus on the incubation of the eggs (a full clutch is usually about 12 eggs). She will "sit" or "set" on the nest, protesting or pecking in defense if disturbed or removed, and she will rarely leave the nest to eat, drink, or dust-bathe. While brooding, the hen maintains the nest at a constant temperature and humidity, as well as turning the eggs regularly during the first part of the incubation. To stimulate broodiness, an owner may place many artificial eggs in the nest, or to stop it they may place the hen in an elevated cage with an open wire floor.

At the end of the incubation period (about 21 days),[17] the eggs, if fertile, will hatch. Development of the egg starts only when incubation begins, so they all hatch within a day or two of each other, despite perhaps being laid over a period of two weeks or so. Before hatching, the hen can hear the chicks peeping inside the eggs, and will gently cluck to stimulate them to break out of their shells. The chick begins by "pipping"; pecking a breathing hole with its egg tooth towards the blunt end of the egg, usually on the upper side. It will then rest for some hours, absorbing the remaining egg yolk and withdrawing the blood supply from the membrane beneath the shell (used earlier for breathing through the shell). It then enlarges the hole, gradually turning round as it goes, and eventually severing the blunt end of the shell completely to make a lid. It crawls out of the remaining shell, and its wet down dries out in the warmth of the nest.

A day-old chick

The hen will usually stay on the nest for about two days after the first egg hatches, and during this time the newly-hatched chicks live off the egg yolk they absorb just before hatching. Any eggs not fertilized by a rooster will not hatch, and the hen eventually loses interest in these and leaves the nest. After hatching, the hen fiercely guards the chicks, and will brood them when necessary to keep them warm, at first often returning to the nest at night. She leads them to food and water; she will call them to edible items, but seldom feeds them directly. She continues to care for them until they are several weeks old, when she will gradually lose interest and eventually start to lay again.

Modern egg-laying breeds rarely go broody, and those that do often stop part-way through the incubation. However, some "utility" (general purpose) breeds, such as the Cochin, Cornish and Silkie, do regularly go broody, and they make excellent mothers, not only for chicken eggs but also for those of other species—even those with much smaller or larger eggs and different incubation periods, such as quail, pheasants, turkeys or geese. Chicken eggs can also be hatched under a broody duck, with varied success.

Poultry farming

A free range rooster on a farm

More than 50 billion chickens are reared annually as a source of food, for both their meat and their eggs. Chickens farmed for meat are called broiler chickens, whilst those farmed for eggs are called egg-laying hens. In total, the UK alone consumes over 29 million eggs per day. Some hens can produce over 300 eggs a year. Chickens will naturally live for 6 or more years, but broiler chickens typically take less than six weeks to reach slaughter size. For laying hens, they are slaughtered after about 12 months, when the hens' productivity starts to decline.

The vast majority of poultry are raised using intensive farming techniques. According to the Worldwatch Institute, 74 percent of the world's poultry meat, and 68 percent of eggs are produced this way.[3] One 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. Advocates of intensive farming say that their highly efficient systems save land and food resources due to increased productivity, stating that the animals are looked after in state-of-the-art environmentally controlled facilities.

Artificial incubation

An egg incubator.

Chicken egg incubation can successfully occur artificially as well. Nearly all fertilized chicken eggs will hatch after 21 days of good conditions - 99.5 °F (37.5 °C) and around 55% relative humidity (increase to 70% in the last three days of incubation to help soften egg shell). Eggs must be turned regularly (usually three to eight times each week) during the first part of the incubation. If the eggs aren't turned, the embryo inside will stick to the shell and may hatch with physical defects. Some incubators turn the eggs automatically. This turning mimics the natural process. An incubating hen will stand up several times a day and shift the eggs around with her beak. However, if the egg is turned during the last week of incubation the chick may have difficulty settling in the correct hatching position.

Many commercial incubators are industrial-sized with shelves holding tens of thousands of eggs at a time, with rotation of the eggs a fully automated process. Home incubators are boxes holding from half a dozen to 75 eggs; they are usually electrically powered, but in the past some were heated with an oil or paraffin lamp.

Chickens as food

Roasted chicken.

The meat of the chicken, also called "chicken", is a type of poultry meat. Because of its relatively low cost, chicken is one of the most used meats in the world. Nearly all parts of the bird can be used for food, and the meat can be cooked in many different ways. Popular chicken dishes include roasted chicken, fried chicken, chicken soup, Buffalo wings, tandoori chicken, butter chicken, and chicken rice. Chicken is also a staple of fast food restaurants.

Chickens as pets

Chickens are sometimes kept as pets and can be tamed by hand feeding, but roosters can sometimes become aggressive and noisy. Some have advised against keeping them around very young children. Certain breeds, however, such as silkies and many bantam varieties are generally docile and are often recommended as good pets around children.[23] Some people find chickens' behaviour entertaining and educational.[24]

Baby chickens, dyed unnatural colors, sold as pets at a Market in Oaxaca, Mexico.

While some cities in the United States allow chickens as pets, the practice is not approved in all localities. Some communities ban only roosters, allowing the quieter hens. The so called "urban hen movement" harks back to the days when chicken keeping was much more common, and involves the keeping of small groups of hens in areas where they may not be expected, such as closely populated cities and suburban areas. City ordinances, zoning regulations or health boards may determine whether chickens may be kept.[25] A general requirement is that the birds be confined to the owner's property, not allowed to roam freely. There may be strictures on the size of the property or how far from human dwellings a coop may be located, etc.[26]

In Asia, chickens with striking plumage have long been kept for ornamental purposes, including feather-footed varieties such as the Cochin from Vietnam, the Silkie from China, and the extremely long-tailed Phoenix from Japan. Asian ornamental varieties were imported into the United States and Great Britain in the late 1800s. Distinctive American varieties of chickens have been developed from these Asian breeds. Poultry fanciers began keeping these ornamental birds for exhibition, a practice that continues today. Individuals in rural communities commonly keep chickens for both ornamental and practical value.

Chicken diseases and ailments

Chickens are susceptible to several parasites, including lice, mites, ticks, fleas, and intestinal worms, as well as other diseases. (Despite the name, they are not affected by Chickenpox; the illness is generally restricted to humans.[27])

Some of the common diseases that affect chickens are shown below:

Name Common Name Caused by
Aspergillosis fungi
Avian influenza bird flu virus
Histomoniasis Blackhead disease protozoal parasite
Botulism toxin
Cage Layer Fatigue mineral deficiencies, lack of exercise
Campylobacteriosis tissue injury in the gut
Coccidiosis parasites
Colds virus
Crop Bound improper feeding
Dermanyssus gallinae Red mite parasite
Egg bound oversized egg
Erysipelas bacteria
Fatty Liver Hemorrhagic Syndrome high-energy food
Fowl Cholera bacteria
Fowl pox virus
Fowl Typhoid bacteria
Gallid herpesvirus 1
or Infectious Laryngotracheitis
virus
Gapeworm Syngamus trachea worms
Infectious Bronchitis virus
Infectious Bursal Disease Gumboro virus
Infectious Coryza bacteria
Lymphoid leukosis Avian leukosis virus
Marek's disease virus
Moniliasis Yeast Infection
or Thrush
fungi
Mycoplasmas bacteria-like organisms
Newcastle disease virus
Necrotic Enteritis bacteria
Omphalitis Mushy chick disease umbilical cord stump
Peritonitis[28] Infection in abdomen from egg yolk
Prolapse
Psittacosis bacteria
Pullorum Salmonella bacteria
Scaly leg parasites
Squamous cell carcinoma cancer
Tibial dyschondroplasia speed growing
Toxoplasmosis protozoal parasite
Ulcerative Enteritis bacteria

Chickens in religion and mythology

In Indonesia the chicken has great significance during the Hindu cremation ceremony. A chicken is considered a channel for evil spirits which may be present during the ceremony. A chicken is tethered by the leg and kept present at the ceremony for its duration to ensure that any evil spirits present during the ceremony go into the chicken and not the family members present. The chicken is then taken home and returns to its normal life.

In ancient Greece, the chicken was not normally used for sacrifices, perhaps because it was still considered an exotic animal. Because of its valour, the cock is found as an attribute of Ares, Heracles, and Athena. The alleged last words of Socrates as he died from hemlock poisoning, as recounted by Plato, were "Crito, I owe a cock to Asclepius; will you remember to pay the debt?", signifying that death was a cure for the illness of life.

The Greeks believed that even lions were afraid of cocks. Several of Aesop's Fables reference this belief.

In the New Testament, Jesus prophesied the betrayal by Peter: "Jesus answered, 'I tell you, Peter, before the rooster crows today, you will deny three times that you know me.'" (Luke 22:34) Thus it happened (Luke 22:61), and Peter cried bitterly. This made the cock a symbol for both vigilance and betrayal.

Earlier, Jesus compares himself to a mother hen when talking about Jerusalem: "O Jerusalem, Jerusalem, you who kill the prophets and stone those sent to you, how often I have longed to gather your children together, as a hen gathers her chicks under her wings, but you were not willing." (Matthew 23:37; also Luke 13:34).

In many Central European folk tales, the devil is believed to flee at the first crowing of a cock.

In traditional Jewish practice, a kosher animal is swung around the head and then slaughtered on the afternoon before Yom Kippur, the Day of Atonement, in a ritual called kapparos. A chicken or fish is typically used because it is commonly available (and small enough to hold). The sacrifice of the animal is to receive atonement, for the animal symbolically takes on all the person's sins in kapparos. The meat is then donated to the poor. A woman brings a hen for the ceremony, while a man brings a rooster. Although not actually a sacrifice in the biblical sense, the death of the animal reminds the penitent sinner that his or her life is in God's hands.

The Talmud speaks of learning "courtesy toward one's mate" from the rooster. This might refer to the fact that when a rooster finds something good to eat, he calls his hens to eat first.

The chicken is one of the Zodiac symbols of the Chinese calendar. Also in Chinese religion, a cooked chicken as a religious offering is usually limited to ancestor veneration and worship of village deities. Vegetarian deities such as the Buddha are not one of the recipients of such offerings. Under some observations, an offering of chicken is presented with "serious" prayer (while roasted pork is offered during a joyous celebration). In Confucian Chinese Weddings, a chicken can be used as a substitute for one who is seriously ill or not available (e.g. sudden death) to attend the ceremony. A red silk scarf is placed on the chicken's head and a close relative of the absent bride/groom holds the chicken so the ceremony may proceed. However, this practice is rare today.

A cockatrice was supposed to have been born from an egg laid by a rooster.

Chickens in history

The first pictures of chickens in Europe are found on Corinthian pottery of the 7th century BC. The poet Cratinus (mid-5th century BC, according to the later Greek author Athenaeus) calls the chicken "the Persian alarm". In Aristophanes's comedy The Birds (414 BC) a chicken is called "the Median bird", which points to an introduction from the East. Pictures of chickens are found on Greek red figure and black-figure pottery.

In ancient Greece, chickens were still rare and were a rather prestigious food for symposia. Delos seems to have been a centre of chicken breeding.

An early domestication of chickens in Southeast Asia is probable, since the word for domestic chicken (*manuk) is part of the reconstructed Proto-Austronesian language (see Austronesian languages). Chickens, together with dogs and pigs, were the domestic animals of the Lapita culture, the first Neolithic culture of Oceania.

Chickens were spread by Polynesian seafarers and reached Easter Island in the 12th century AD, where they were the only domestic animal, with the possible exception of the Polynesian Rat (Rattus exulans). They were housed in extremely solid chicken coops built from stone.

The Romans used chickens for oracles, both when flying ("ex avibus", Augury) and when feeding ("auspicium ex tripudiis", Alectryomancy). The hen ("gallina") gave a favourable omen ("auspicium ratum"), when appearing from the left (Cic.,de Div. ii.26), like the crow and the owl.

For the oracle "ex tripudiis" according to Cicero (Cic. de Div. ii.34), any bird could be used, but normally only chickens ("pulli") were consulted. The chickens were cared for by the pullarius, who opened their cage and fed them pulses or a special kind of soft cake when an augury was needed. If the chickens stayed in their cage, made noises ("occinerent"), beat their wings or flew away, the omen was bad; if they ate greedily, the omen was good.

In 249 BC, the Roman general Publius Claudius Pulcher had his chickens thrown overboard when they refused to feed before the battle of Drepana, saying "If they won't eat, perhaps they will drink." He promptly lost the battle against the Carthaginians and 93 Roman ships were sunk. Back in Rome, he was tried for impiety and heavily fined.

In 161 BC, a law was passed in Rome that forbade the consumption of fattened chickens. It was renewed a number of times, but does not seem to have been successful. Fattening chickens with bread soaked in milk was thought to give especially delicious results. The Roman gourmet Apicius offers 17 recipes for chicken, mainly boiled chicken with a sauce. All parts of the animal are used: the recipes include the stomach, liver, testicles and even the pygostyle (the fatty "tail" of the chicken where the tail feathers attach).

The Roman author Columella gives advice on chicken breeding in his eighth book of his treatise on agriculture. He identifies Tanagrian, Rhodic, Chalkidic and Median (commonly misidentified as Melian) breeds, which have an impressive appearance, a quarrelsome nature and were used for cockfighting by the Greeks. For farming, native (Roman) chickens are to be preferred, or a cross between native hens and Greek cocks. Dwarf chickens are nice to watch because of their size but have no other advantages.

Per Columella, the ideal flock consists of 200 birds, which can be supervised by one person if someone is watching for stray animals. White chickens should be avoided as they are not very fertile and are easily caught by eagles or goshawks. One cock should be kept for five hens. In the case of Rhodian and Median cocks that are very heavy and therefore not much inclined to sex, only three hens are kept per cock. The hens of heavy fowls are not much inclined to brood; therefore their eggs are best hatched by normal hens. A hen can hatch no more than 15-23 eggs, depending on the time of year, and supervise no more than 30 hatchlings. Eggs that are long and pointed give more male, rounded eggs mainly female hatchlings.

Per Columella, chicken coops should face southeast and lie adjacent to the kitchen, as smoke is beneficial for the animals. Coops should consist of three rooms and possess a hearth. Dry dust or ash should be provided for dust-baths.

According to Columella, chicken should be fed on barley groats, small chick-peas, millet and wheat bran, if they are cheap. Wheat itself should be avoided as it is harmful to the birds. Boiled ryegrass (Lollium sp.) and the leaves and seeds of alfalfa (Medicago sativa L.) can be used as well. Grape marc can be used, but only when the hens stop laying eggs, that is, about the middle of November; otherwise eggs are small and few. When feeding grape marc, it should be supplemented with some bran. Hens start to lay eggs after the winter solstice, in warm places around the first of January, in colder areas in the middle of February. Parboiled barley increases their fertility; this should be mixed with alfalfa leaves and seeds, or vetches or millet if alfalfa is not at hand. Free-ranging chickens should receive two cups of barley daily.

Columella advises farmers to slaughter hens that are older than three years, because they no longer produce sufficient eggs.

Capons were produced by burning out their spurs with a hot iron. The wound was treated with potter's chalk.

For the use of poultry and eggs in the kitchens of ancient Rome see Roman eating and drinking.

Chickens in South America

An unusual variety of chicken that has its origins in South America is the araucana, bred in southern Chile by Mapuche people. Araucanas, some of which are tailless and some of which have tufts of feathers around their ears, lay blue-green eggs. It has long been suggested that they predate 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 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.[29] These results appeared to confirm that the chickens came from Polynesia and that there were transpacific contacts between Polynesia and South America before Columbus's arrival in the Americas.[30]

However, a later report looking at the same specimens concluded:

A published, apparently pre-Columbian, Chilean specimen and six pre-European Polynesian specimens also cluster with the same European/Indian subcontinental/Southeast Asian sequences, providing no support for a Polynesian introduction of chickens to South America. In contrast, sequences from two archaeological sites on Easter Island group with an uncommon haplogroup from Indonesia, Japan, and China and may represent a genetic signature of an early Polynesian dispersal. Modeling of the potential marine carbon contribution to the Chilean archaeological specimen casts further doubt on claims for pre-Columbian chickens, and definitive proof will require further analyses of ancient DNA sequences and radiocarbon and stable isotope data from archaeological excavations within both Chile and Polynesia.[31]

See also

References

  1. ^ according to Firefly Encyclopedia of Birds, Ed. Perrins, Christopher. Buffalo, N.Y.: Firefly Books, Ltd., 2003.
  2. ^ a b Sherman, David M. (2002). Tending Animals in the Global Village. Blackwell Publishing. 46. ISBN 0683180517.
  3. ^ Maguelonne Toussaint-Samat, (Anthea Bell, translator) The History of Food, Ch. 11 "The History of Poultry", revised ed. 2009, p. 306.
  4. ^ Howard Carter, "An Ostracon Depicting a Red Jungle-Fowl (The Earliest Known Drawing of the Domestic Cock)" The Journal of Egyptian Archaeology, 9.1/2 (April 1923), pp. 1-4.
  5. ^ Eriksson J, Larson G, Gunnarsson U, Bed'hom B, Tixier-Boichard M, et al. (2008) Identification of the Yellow Skin Gene Reveals a Hybrid Origin of the Domestic Chicken. PLoS Genet January 23, 2008 [1].
  6. ^ cockerel - Definitions from Dictionary.com
  7. ^ pullet - Definitions from Dictionary.com
  8. ^ "Definition of "chook" in Encarta. The vernacular use is said to be offensive in this dictionary but it may also be used as a term of jocular familiarity". Archived from the original on 2009-10-31. http://www.webcitation.org/5kwQrJia9.  
  9. ^ "Info on Chicken Care". ideas4pets. 2003. http://www.ideas-4-pets.com/pages-infopages/pages_id-24/index.html. Retrieved 2008-08-13.  
  10. ^ Gerard P.Worrell AKA "Farmer Jerry". "Frequently asked questions about chickens & eggs". Ferry Landing Farm & Apiary. http://gworrell.freeyellow.com/chickenfaq.html. Retrieved 2008-08-13.  
  11. ^ The Poultry Guide - A to Z and FAQs
  12. ^ Broiler Chickens Fact Sheet // Animals Australia
  13. ^ Ten weeks to live | Food and drink | Life and Health
  14. ^ Smith, Jamon. Tuscaloosanews.com "World’s oldest chicken starred in magic shows, was on 'Tonight Show’", Tuscaloosa News (Alabama, USA). 6 August 2006. Retrieved on 26 February 2008.
  15. ^ Introducing new hens to a flock « Musings from a Stonehead
  16. ^ Scientists Find Chickens Retain Ancient Ability to Grow Teeth Ammu Kannampilly, ABC News, 2006-02-27. Retrieved 2007-10-01.
  17. ^ a b c Grandin, Temple; Johnson, Catherine (2005). [69-71 Animals in Translation]. New York, New York: Scribner. ISBN 0743247698. 69-71.  
  18. ^ CHOF, p496, citing Crawford 1994
  19. ^ a b c d e f g CHOF : The Cambridge History of Food, 2000, Cambridge University Press, vol.1, pp496-499
  20. ^ CHOF, p496, citing Fumihito, 1994
  21. ^ CHOF, p496, citing West & Zhou, 1988
  22. ^ CHOF, p496, citing Zeuner 1963, Crawford 1984
  23. ^ "Clucks and Chooks: A Guide To Keeping Chickens". http://www.henkeeping.co.uk/which.html.  
  24. ^ United Poultry Concerns. "Providing a Good Home for Chickens". http://www.upc-online.org/home.html. Retrieved 2009-05-04.  
  25. ^ http://www.mypetchicken.com/chickenFAQ.aspx#InViolation
  26. ^ My Pet Chicken: Links gives links to regulations of some major U.S. cities that allow chickens.
  27. ^ White TM, Gilden DH, Mahalingam R.. "An animal model of varicella virus infection". http://www.ncbi.nlm.nih.gov/pubmed/11556693. Retrieved 2009-05-01.  
  28. ^ "Clucks and Chooks: guide to keeping chickens". http://www.henkeeping.co.uk.  
  29. ^ DNA reveals how the chicken crossed the sea Brendan Borrell, Nature, 5 June 2007. Retrieved 2007-10-01.
  30. ^ A. A. Storey et al., "Radiocarbon and DNA evidence for a pre-Columbian introduction of Polynesian chickens to Chile", Proceedings of the National Academy of Sciences of the United States of America, www.pnas.org/cgi/doi/10.1073/pnas.0703993104; John Noble Wilford, "First Chickens in Americas were Brought from Polynesia, New York Times, June 5, 2007
  31. ^ Indo-European and Asian origins for Chilean and Pacific chickens revealed by mtDNA. Jaime Gongora, Nicolas J. Rawlence, Victor A. Mobegi, Han Jianlin, Jose A. Alcalde, Jose T. Matus, Olivier Hanotte, Chris Moran, J. Austin, Sean Ulm, Atholl J. Anderson, Greger Larson and Alan Cooper, "Indo-European and Asian origins for Chilean and Pacific chickens revealed by mtDNA" PNAS July 29, 2008 vol. 105 no 30[2]

Further reading

  • Smith, Page; Charles Daniel (April 2000). The Chicken Book. University of Georgia Press. ISBN 082032213X.  
  • Green-Armytage, Stephen (October 2000). Extraordinary Chickens. Harry N. Abrams. ISBN 0810933438.  

External links


Travel guide

Up to date as of January 14, 2010

From Wikitravel

Contents

Chicken is a small village located at milepost 66.8 on the Taylor Highway in Alaska. It is one of the only places along this highway where gas is available, and is therefore a popular rest stop. Local legend is that the town was named after a group of miners decided to name it Ptarmigan after the local birds, but unable to agree on the spelling finally decided "Hell, let's just call it Chicken" (the nickname for ptarmigan).

Get in

The vast majority of visitors will arrive by car along the Taylor Highway. The road is not maintained year-round, so travel by road may be impossible once snow falls. The town also has a small dirt runway (IATA: CKX) located 0.8 miles east of the highway that is accessible to private planes year-round.

Get around

There are 3 businesses in Chicken: "Chicken Gold Camp & Outpost", "Downtown Chicken" and the "Goldpanner". The first two are located a short distance off of the highway on the Airport Road spur road. The Goldpanner gift shop is located along the Taylor highway.

Given the town's small size (the official population was 38 in 2002) the most obvious way to get around is by foot. Those unwilling to walk the short distances between the town's three businesses may want to ask themselves what they're doing in the wilds of Alaska!

  • Pedro Gold Dredge #4, (located at the Chicken Gold Camp/Chicken Creek Outpost). This gold dredge operated on Chicken Creek from 1959 until 1967, and was previously used on Pedro Creek outside of Fairbanks. The Pedro Dredge is a National Historic Site and is open to daily tours. It is one of the most complete Alaska gold dredges, an example of the type of equipment used to mine the area's gold deposits.  edit
  • Chicken Gold Camp & Outpost, +1-907-235-6396 (winter) +1-520-413-1480 (summer), [1]. Gold panning and recreational mining are provided on their claims for daily fees. Rental equipment is available. Kayaking adventures on the nearby Fortymile River are also available. $10 to $50 per day for mining activities and $30 for 1/2 day kayak rentals.  edit
  • Chickenstock Music Festival, +1-907-590-2681, [2]. Chickenstock 2009 will be the third annual and a new gathering of global ‘chickenites” and ‘chickenuts’ and local bluegrass music. So pack up your ‘nest’, ‘comb’ your feathers and come ‘strut’ your stuff in the midnight sun on June 13th, 2009.  edit
  • Chicken Gold Camp & Outpost, +1-907-235-6396 (winter) +1-520-413-1480 (summer). [3] The cafe menu includes fresh baked scones, egg souffles, deli style paninis, soup du jour, and BBQ chicken. Espresso drinks and other beverage concoctions as well as hand-scooped ice cream are also available.  edit
  • Chicken Gold Camp & Outpost, +1-907-235-6396 (winter) +1-520-413-1480 (summer), [4]. Offers cabins for up to six or rooms with two single beds. Amenities include propane heat, free wireless internet, kitchenettes, and access to public restrooms and pay-showers. $90 per night for cabins (double occupancy), $75 per night for a room (double occupancy).  edit
  • Chicken Center RV Park. There is a RV park in downtown chicken that offers picnic tables and plugins.  edit
  • Chicken Gold Camp & Outpost, +1-907-235-6396 (winter) +1-520-413-1480 (summer), [5]. 20 sites with hookups, and amenities including free wireless internet, free firewood, dump station, potable water, and access to public restrooms and pay-showers. $18 per night with hookup, $10 per night without.  edit
  • Tok - Located 78 miles away at the southern end of the Taylor Highway at its junction with the Alaska Highway.
  • Dawson City - One of the most famous and historic gold mining towns in the North, Dawson City is located 108 miles away along the Taylor and Top of the World highways.
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Wikispecies

Up to date as of January 23, 2010
(Redirected to Gallus gallus domesticus article)

From Wikispecies

Gallus gallus domesticus

Taxonavigation

Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Galliformes
Familia: Phasianidae
Subfamilia: Phasianinae
Genus: Gallus
Species: Gallus gallus
Subspecies: G. g. domesticus

Name

Gallus gallus domesticus (Linnaeus, 1758)

Synonyms

Gallus domesticus Linnaeus, 1758

Reference

  • Systema Naturae ed.10 p.158

Vernacular names

Deutsch: Bankivahuhn
Ελληνικά: Κότα
English: Domestic Chicken
Español: Gallina domestica
Français: Poule
한국어: 닭
Italiano: Pollo domestico
Nederlands: Bankivahoen
日本語: ニワトリ
Polski: Kurczak
Русский: Курица
Svenska: Röd djungelhöna
Türkçe: Evcil Tavuk
中文: 雞
Wikimedia Commons For more multimedia, look at Gallus gallus domesticus on Wikimedia Commons.

Simple English

Chicken
File:Female
A rooster (left) and hen (right)
Conservation status
Domesticated
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Phasianidae
Genus: Gallus
Species: G. gallus

A chicken (Gallus gallus domesticus) is a kind of domesticated bird. It is raised widely for its meat and eggs.[1] There are 24 billion chickens worldwide.[2] They are usually kept by humans as livestock, which means it is kept for its meat and eggs. Chickens are said to be flightless because they can only jump short distances.

A male chicken is called a rooster or a cock (short for cockerel). A female chicken is called a hen. A young chicken is called a chick. Like other female birds, hens lay eggs which can hatch into chicks.

Chickens can be farmed intensively. This lets farms make a lot of chicken meat and eggs, but this is not good for the chickens.

Contents

Chicken and chicken pox

Chicken pox has nothing to do with chickens. When chicken pox was first described, it was noted that the pox spots looked like the vegetable called chick peas placed upon the skin. The Latin word for chick peas is cicer, and that is the original word that chicken pox got its name from.[3]

Meat

File:Roast
Roast chicken

Because of the low cost, chicken meat (also called "chicken") is one of the most used meat in the world. Americans eat 8 billion chickens every year.[4] The most popular dishes with chicken are Buffalo wings, butter chicken, chicken rice, chicken soup, fried chicken, roasted chicken (see picture above), and tandoori chicken.

One of the main companies that create ready made chicken to eat is KFC which is an american company

Gaming

[[File:|300px|thumb|Two gamecocks fighting in rural Thailand.]] In some parts of the world people breed chickens to fight and they bet money on which of two gamecocks will win.

Related Pages

References

  1. "chicken (bird) -- Britannica Online Encyclopedia". britannica.com. http://www.britannica.com/EBchecked/topic/110675/chicken. Retrieved 1 May 2010. 
  2. according to Firefly Encyclopedia of Birds, Ed. Perrins, Christopher. Buffalo, N.Y.: Firefly Books, Ltd., 2003.
  3. "Why is it called chicken pox?". parenting.ivillage.com. http://parenting.ivillage.com/tp/tphealth/0,,3q8n,00.html. Retrieved 1 May 2010. 
  4. "Chicken Facts by The Easy Chicken for beginners". shilala.homestead.com. http://shilala.homestead.com/chickenfacts.html. Retrieved 1 May 2010. 
Look up Chicken in Wikispecies, a directory of species
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The English Wikibooks has more about this subject:
bjn:Hayamkoi:Курӧгpcd:Poulhe








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