What is a Chicken? A Look at the Bird We Love to Eat

Some breeds, such as the Cochin, Cornish and Silkie, regularly go broody and make excellent mothers. During this time, the newly-hatched chicks live off the egg yolk they absorb just before hatching. All the time she is sitting in the nest she will regularly turn the eggs keeping them at a constant temperature and humidity.

Breeders create various strains for specific purposes, such as egg and meat production. A chicken strain is a family of chickens that results from selective breeding through internal insemination. They are white, black, red Pyle and black-breasted varieties of the Malay breed. The other popular Asiatic breed that comes in multiple varieties includes the Malay.

Strains of Chickens

The hen sits on the nest, fluffing up or pecking defensively if disturbed. A flock thus uses only a few preferred locations, rather than having a different nest for every bird. Reproduction declines with age, thought to be due to a decline in GnRH-I-N. The dance triggers a response in the hen and when she responds to his call, the rooster may mount the hen and proceed with the mating. 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. Chickens give different warning calls to indicate that a predator is approaching from the air or on the ground.

Specialized breeds such as broilers and laying hens have been developed for meat and egg production, respectively. Females (mature hens and younger chickens, called pullets) are raised for meat and for their edible eggs. The chicken is perhaps the khelaghor-bangladesh.com most widely domesticated fowl, raised worldwide for its meat and eggs. Chicken, (Gallus gallus), any of more than 60 breeds of medium-sized poultry that are primarily descended from the wild red jungle fowl (Gallus gallus, family Phasianidae, order Galliformes) of India. 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.

Chicken’s Anatomy External Part

Chickens reached Egypt via the Middle East for purposes of cockfighting about 1400 BC and became widely bred in Egypt around 300 BC. 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.

Chickens are capable of mobbing and killing a weak or inexperienced predator, such as a young fox. 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).

• The hen sits on the nest, fluffing up or pecking defensively if disturbed.
• An early study proposed that a single domestication event of the red junglefowl in present-day Thailand gave rise to the modern chicken.
• These domesticated chickens spread across Southeast and South Asia where they interbred with local wild species of junglefowl, forming genetically and geographically distinct groups.
• They are improved chicken breeds that farmers raise for meat and eggs.
• With a population of more than 24 billion in 2003, there are more chickens in the world than any other bird.

Broiler breeds typically take less than six weeks to reach slaughter size, some weeks longer for free-range and organic broilers. The first pictures of chickens in Europe are found on Corinthian pottery of the 7th century BC. Phoenicians spread chickens along the Mediterranean coasts as far as Iberia. These chickens may have been introduced during pre-Columbian times to South America via Polynesian seafarers, but this is disputed. Skeletons of birds in the Gallus genus were used as grave goods at the site, confirming domestication.

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. Chickens are social, inquisitive, intelligent birds, and many people find their behaviour entertaining.

There are many different breeds that come in a variety of colors. With a population of more than 24 billion in 2003, there are more chickens in the world than any other bird. The chicken is believed to have descended from the wild Indian and south-east Asian Red Junglefowl which is biologically classified as the same species.

Although chickens are flightless birds, they do have a tendency to attempt flight. Hens lay eggs that range in color from white to pale brown and other pale colors depending on the breed. There are over 150 different breeds of chicken that come in various colors, patterns and sizes. 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.