Chicken

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.

Chickens come in various varieties, breeds, classes, and strains. 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. Although chickens are flightless birds, they do have a tendency to attempt flight. Hens lay eggs that https://khela88-bangladesh.com range in color from white to pale brown and other pale colors depending on the breed.

• Breeders create various strains for specific purposes, such as egg and meat production.
• In some other countries, flocks are sometimes force-moulted rather than being slaughtered to re-invigorate egg-laying.
• Add chicken to one of your lists below, or create a new one.
• Phoenicians spread chickens along the Mediterranean coasts as far as Iberia.
• During the Hellenistic period (4th–2nd centuries BC), in the southern Levant, chickens began to be widely domesticated for food.

Farming

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 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.

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. By the mid-20th century, however, meat production had outstripped egg production as a specialized industry. Farmers have developed numerous breeds and varieties to fulfill commercial requirements.

Sexed Chicks and Straight-Run Chicks

Exactly when and where the chicken was domesticated was controversial. 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. When eggs are placed in a hypoxic environment, chicken embryos from these populations express much more hemoglobin than embryos from other chicken populations. Under natural conditions, most birds lay only until a clutch is complete; they then incubate all the eggs. In older sources, and still often in trade and scientific contexts, chickens as a species are described as common fowl or domestic fowl.

Dog Breeds

Ancona is a widespread breed belonging to the Mediterranean class. They include Leghorns, Catalans, Andulusians, and Anconas. They include Cornish, Australorp, Sussex, and Orpington. They include Barnevelder, Lakenvelder, Wellsummer, Polish and Marans. They include Buckeye, Delaware, Jersey Giant, and New Hampshire. These classes include American, English, Mediterranean, Asiatic, and continental.

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. The chicks imprint on the hen and subsequently follow her continually.

Genetic sequencing of chicken bones from archaeological sites in Europe revealed that in the High Middle Ages chickens became less aggressive and began to lay eggs earlier in the breeding season. During the Hellenistic period (4th–2nd centuries BC), in the southern Levant, chickens began to be widely domesticated for food. 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. The domestic chicken has subsequently hybridised with grey junglefowl, Sri Lankan junglefowl and green junglefowl; a gene for yellow skin, for instance, was incorporated into domestic birds from the grey junglefowl (G. sonneratii). Inbreeding of White Leghorn chickens tends to cause inbreeding depression expressed as reduced egg number and delayed sexual maturity.