CHICKEN English meaning

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. Certain breeds, such as silkies and many bantam varieties, are generally docile and are often recommended as good pets around children with disabilities. This stimulates the hen to lose her feathers but also re-invigorates egg-production. In some other countries, flocks are sometimes force-moulted rather than being slaughtered to re-invigorate egg-laying. After 12 months of laying, the commercial hen’s egg-laying ability declines to the point where the flock is commercially unviable.

It comes in two varieties, the rose comb and the single comb. Ancona is a widespread breed belonging to the Mediterranean class. They include Leghorns, Catalans, Andulusians, and Anconas.

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Egg laying is stimulated by the long stretches of daylight that occur during the warmer months; however, artificial lights placed in chicken coops can trigger a hen’s egg laying response throughout the year. Despite the chicken’s close relationship with the red jungle fowl, there is evidence that the gray jungle fowl (G. sonneratii) of southern India and other jungle fowl species, also members of Gallus, may have contributed to the bird’s ancestry. In the process of domestication, chickens were apparently kept initially for cockfighting, and only later used for food.

Farming

Re-examination of bones from over 600 sites, and dating of those from 23 sites, identified the earliest probable chicken bones as from central Thailand, at Ban Non Wat, some 3,250 years ago. 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. The hen sits on the nest, fluffing up or pecking defensively if disturbed. Reproduction declines with age, thought to be due to a decline in GnRH-I-N.

Chickens are common and widespread domestic animals, with a total population of 23.7 billion as of 2018update. Breeding increased under the Roman Empire and reduced in the Middle Ages. Middle Eastern chicken remains go back to a little earlier than 2000 BC in Syria. Chicken remains have been difficult to date, given the small and fragile bird bones; this may account for discrepancies in dates given by different sources. Chickens reached Egypt via the Middle East for purposes of cockfighting about 1400 BC and became widely bred in Egypt around 300 BC.

• The market for chicken meat has grown dramatically since then, with worldwide exports reaching nearly 12.5 million metric tons (about 13.8 million tons) by the early 21st century.
• Chickens are social, inquisitive, intelligent birds, and many people find their behaviour entertaining.
• 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.
• Reproduction declines with age, thought to be due to a decline in GnRH-I-N.

The standard chicken breeds come in different classes. Egg-producing breeds include ISA brown, Leghorn, Marans, Plymouth Rock, Sussex, and Wyandotte. Some common breeds include Rhode Island Red, Cornish Cross, and Leghorns. Some physical features that distinguish these breeds include size, skin color, comb type, and plumage color. Some physical characteristics of chickens include combs, wattles, and earlobes.

Chickens have a well-developed gizzard (a part of the stomach that contains tiny stones) that grinds up their food. Mature males have long been used for sport (i.e., cockfighting, now outlawed in many jurisdictions) as well as for breeding. Descendants of those domestications have spread throughout the world in several waves for at least the last 2,000 years. In groups of male chicks, however, fights for dominance may continue into adulthood.

This involves complete withdrawal of food (and sometimes water) for 7–14 days or sufficiently long to cause a body weight loss jaya9betting.com/bn/ of 25 to 35%, or up to 28 days under experimental conditions. 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. 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.