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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. A flock thus uses only a few preferred locations, rather than having a different nest for every bird. Hens often try to lay in nests that already contain eggs and sometimes move eggs from neighbouring nests into their own. The concept of dominance, involving pecking, was described in female chickens by Thorleif Schjelderup-Ebbe in 1921 as the „pecking order”. Chickens are gregarious, living in flocks, and incubate eggs and raise young communally.

Chickens have a communal approach to the incubation of eggs and raising of young. Chickens are gregarious birds and live together as a flock. Chickens will sometimes attempt flight simply to explore their surroundings, however, they will especially fly in an attempt to flee when they perceive danger or pursued by a predator.

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. Chickens are common and widespread domestic animals, with a total population of 23.7 billion as of 2018update. 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. The chicks imprint on the hen and subsequently follow her continually.

Animal Classification

Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg-laying is 371 eggs in 364 days. During the Hellenistic period (4th–2nd centuries BC), in the southern Levant, chickens began to be widely domesticated for food. 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. Chickens are descended primarily from the red junglefowl (Gallus gallus) and are scientifically classified as the same species.

Cockfighting

Newly hatched chicks of both https://khelovipbangladesh.com modern and heritage varieties weigh the same, about 37 g (1.3 oz). 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). Chickens are social animals with complex vocalizations and behaviors, and feature in folklore, religion, and literature across many societies.

• Chickens reached Egypt via the Middle East for purposes of cockfighting about 1400 BC and became widely bred in Egypt around 300 BC.
• Chickens are capable of mobbing and killing a weak or inexperienced predator, such as a young fox.
• It was first domesticated around 8,000 years ago and is one of the most common and widespread domesticated animals in the world.
• By the mid-20th century, however, meat production had outstripped egg production as a specialized industry.
• The time between ovulation and egg-laying is approximately 23–26 hours.

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. Skeletons of birds in the Gallus genus were used as grave goods at the site, confirming domestication. 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. As with all birds, reproduction is controlled by a neuroendocrine system, the Gonadotropin-Releasing Hormone-I neurons in the hypothalamus.

Chickens are primarily kept for their meat and eggs, though they are also kept as pets. It was first domesticated around 8,000 years ago and is one of the most common and widespread domesticated animals in the world. The life span of a chicken varies between 5 – 7 years although there have been cases of chickens living 20 years or so. During this time, the newly-hatched chicks live off the egg yolk they absorb just before hatching.

At the end of the incubation period, which is an average of 21 days, the eggs (if fertilized) will hatch and the broody hen will take care of her 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. Domestic chickens are typically fed commercially prepared feed that includes a protein source as well as grains. Chickens can be kept as pets, for breeding, egg laying and a food product.