Each flock of chickens develops a social hierarchy that determines access to food, nesting sites, mates, and other resources. At about six months, males produce viable sperm, and females produce viable eggs. Despite the chicken\u2019s 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\u2019s ancestry. The chicken is a sacred animal in many cultures and deeply embedded in belief systems and religious practices.Roosters are sometimes used for divination, a practice called alectryomancy.<\/p>\n
Breeding increased under the Roman Empire and reduced in the Middle Ages. Middle Eastern chicken remains go back to a little earlier than 2000\u00a0BC in Syria. Chickens reached Egypt via the Middle East for purposes of cockfighting about 1400\u00a0BC and became widely bred in Egypt around 300\u00a0BC. 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.<\/p>\n
Skeletons of birds in the Gallus genus were used as grave goods at the site, confirming domestication. The chicks imprint on the hen and subsequently follow her continually. 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. Hens often try to lay in nests that already contain eggs and sometimes move eggs from neighbouring nests into their own.<\/p>\n
Archaeological evidence appeared to support domestic chickens in Southeast Asia well before 6000 BC, China by 6000 BC and India by 2000 BC. Exactly when and where the chicken was domesticated was controversial. Inbreeding of White Leghorn chickens tends to cause inbreeding depression expressed as reduced egg number and delayed sexual maturity. When eggs are placed in a hypoxic environment, chicken embryos from these populations express much more hemoglobin than embryos from other chicken populations.<\/p>\n
Under natural conditions, most birds lay only until a clutch is complete; they then incubate all the eggs. 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. In older sources, and still often in trade and scientific contexts, chickens as a species are described as common fowl or domestic fowl. Many immature males (cockerels) are castrated (usually chemically, with hormones that cause atrophying of the testicles) to become meat birds (capons). 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.<\/p>\n
Specialized breeds such as broilers and laying hens have been developed for meat and egg production, respectively. In the United States alone, more than 8 billion chickens are slaughtered each year for meat, and more than 300 million chickens are reared for egg production. More than 50 billion chickens are reared annually as a source of meat and eggs. An early study proposed that a single domestication event of the red junglefowl in present-day Thailand gave rise to the modern chicken. It is estimated that chickens share between 71 and 79% of their genome with red junglefowl.<\/p>\n
A male’s crowing is a loud and sometimes shrill call, serving as a territorial signal to other males, and in response to sudden disturbances within their surroundings. Chickens are capable of mobbing and killing a weak or inexperienced predator, such as a young fox. Some breeds have a mutation that causes extra feathering under the face, giving the appearance of a beard. Modern varieties however grow much faster; by day 35 a Ross 708 broiler may weigh 1.8\u00a0kg (4.0\u00a0lb) as against the 1.05\u00a0kg (2.3\u00a0lb) of a heritage chicken of the same age.<\/p>\n
As with all birds, reproduction is controlled by a neuroendocrine system, the Gonadotropin-Releasing Hormone-I neurons in the hypothalamus. Sperm transfer occurs by cloacal contact between the male and female, in an action called the ‘cloacal kiss’. Chickens have been thought of primarily as providers of food, but their cognition, emotions, and sociality are comparable with other birds and mammals. Chickens are gregarious, living in flocks, and incubate eggs and raise young communally. The body is round, the legs are unfeathered in most breeds, and the wings are short. Chicken can mean a chick, and this was historically the meaning of the word chicken, as in William Shakespeare’s play Macbeth, where Macduff laments the death of “all my pretty chickens and their dam”.<\/p>\n
Newly hatched chicks of both modern and heritage varieties weigh the same, about 37\u00a0g (1.3\u00a0oz). While the origin is Germanic, it is unclear exactly where the word came from, although it could ultimately have come from an imitation of the sound a chicken makes. The word chicken comes from Old English cicen (pronounced essentially the same as in Modern English).<\/p>\n
Domesticated chickens freely interbreed with populations of red junglefowl. Strongly inbred Langshan chickens display obvious inbreeding depression in reproduction, particularly for traits such as age when the first egg is laid and egg number. Only hens that could no longer produce enough eggs were killed and sold for meat. Only in the early 20th century, however, did chicken meat and eggs become mass-production commodities. Although many taxonomists and ornithologists consider it as a domesticated form of the wild red jungle fowl, some classify it as a subspecies of the khela88-bangladesh.com<\/a> red jungle fowl (i.e., G. gallus domesticus), whereas others, including the U.S.<\/p>\n","protected":false},"excerpt":{"rendered":" Chicken recipes Each flock of chickens develops a social hierarchy that determines access to food, nesting sites, mates, and other resources. At about six months, males produce viable sperm, and females produce viable eggs. Despite the chicken\u2019s close relationship with the red jungle fowl, there is evidence that the gray jungle fowl (G. sonneratii) of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[212],"tags":[],"class_list":["post-51235","post","type-post","status-publish","format-standard","hentry","category-khela88-bangladesh-com"],"acf":[],"_links":{"self":[{"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/posts\/51235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/comments?post=51235"}],"version-history":[{"count":1,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/posts\/51235\/revisions"}],"predecessor-version":[{"id":51236,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/posts\/51235\/revisions\/51236"}],"wp:attachment":[{"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/media?parent=51235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/categories?post=51235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mobisoft-me.com\/website\/wp-json\/wp\/v2\/tags?post=51235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}