Chicken Wikipedia

These domesticated chickens spread across Southeast and South Asia where they interbred with local wild species of junglefowl, forming genetically and geographically distinct groups. 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. 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.

Best chicken price in pakistan. Discover high-quality fresh chicken at Alfatah.pk. Mature males have long been used for sport (i.e., cockfighting, now outlawed in many jurisdictions) as well as for breeding. Modern high-volume poultry farms, with rows of cages stacked indoors for control of heat, light, and humidity, began to proliferate in Great Britain about 1920 and in the United States after World War II. Descendants of those domestications have spread throughout the world in several waves for at least the last 2,000 years.

A chicken’s physical characteristics differ by breed. Pullets are female chickens that haven’t reached adulthood. Male chickens become cocks or roosters after full maturity.

Animal Classification

The chicken (Gallus gallus domesticus) is a domesticated form of the red junglefowl (Gallus gallus), originally native to Southeast Asia. They are improved chicken breeds that farmers raise for meat and eggs. Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg-laying is 371 eggs in 364 days. 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.

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Chickens have been featured in art in farmyard scenes such as Adriaen van Utrecht’s 1646 Turkeys and Chickens and Walter Osborne’s 1885 Feeding the Chickens. The pseudo-riddle « Why did the chicken cross the road? » dates to 1847, or earlier. This involves https://khelaghor-bangladesh.com the sacrifice of a sacred rooster, often during a ritual cockfight, used as a form of communication with the gods.

• Dual-purpose chickens are suitable for eggs and meat.
• A broody hen will sit fast on her nest and will protest if disturbed or removed.
• Subsequent ovulations may occur within an hour after the previous egg was laid, allowing some hens to produce as many as 300 eggs per year.
• 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.

Chickens are featured widely in folklore, religion, literature, and popular culture. The chicken was the first bird species to have its genome sequenced. 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. Equally important, embryologists can carry out experiments on such embryos, close the egg again and study the effects later in development.

After 12 months of laying, the commercial hen’s egg-laying ability declines to the point where the flock is commercially unviable. Genomic studies estimated that the chicken was domesticated 8,000 years ago in Southeast Asia and spread to China and India 2,000 to 3,000 years later. 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.

Domestication

A hen is an adult female chicken that is over six months old. One of the best ways of classifying chickens is according to their sex and age. Some common chicken strains include star cross white. Poultry experts also classify chickens into strains. The Yokohama breed is an Asiatic breed that comes in white and Red shoulder varieties. The English chicken class consists of chickens originating from the UK and Australia.

Many people obtain chickens for their egg production but often name them and treat them as any other pet like cats or dogs. According to the Worldwatch Institute, 74% of the world’s poultry meat and 68% of eggs are produced this way. 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.Viral diseases include avian influenza. 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. Analysis of the most popular commercial breed shows that the White Leghorn breed possesses a mosaic of divergent ancestries inherited from different subspecies of red junglefowl.