All of the various sorts of poultry are often organized into four categories: landfowl, waterfowl, game et al. . "Poultry" are often defined as domestic fowls, including chickens, turkeys, geese and ducks, raised for the assembly of meat or eggs and therefore the word is additionally used for the flesh of those birds used as food. The Encyclopædia Britannica lists an equivalent bird groups but also includes guinea and squabs (young pigeons). an outsized sort of poultry products (meat, eggs, feathers, goose fat, foie gras, and skin) is one among the factors contributing to the event of poultry production. Modern sorts of chicken like the Cornish Cross, are bred specifically for meat production, with a stress placed on the ratio of feed to meat produced by the animal. the foremost common breeds of chicken consumed within the U.S. are Cornish and White Rock. Chickens raised specifically for food are called broilers.