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In the U.S., the average feed conversion ratio (FCR) of a broiler was 1.91 kilograms of feed per kilograms of liveweight in 2011, an improvement from 4.70 in 1925. [18] Canada has a typical FCR of 1.72. [19] New Zealand commercial broiler farms have recorded the world's best broiler chicken FCR at 1.38. [20]
In 2008, all Cobb line birds made up around 30-40% of global broilers. [10] In 2016, the Cobb 500 alone was nearly 50%. [3] More broadly, fast-growing chickens now make up the vast majority of the global chicken supply. As of 2021, 90% of the global broiler population is part of either the Cobb or Ross lines, which are both fast-growing. [11]
The chicken breeds recognized by the American Poultry Association are listed in the American Standard of Perfection. They are categorized into classes: standard-sized breeds are grouped by type or by place of origin, while bantam breeds are classified according to type or physical characteristics .
The cover of the 1930 edition. The American Standard of Perfection is the official book of breed standards of the American Poultry Association.It classifies and describes the standard physical appearance, coloring and temperament for many breeds of poultry recognized in the United States, including chickens, ducks, turkeys, geese and guinea fowl, but not pigeons.
Illustration of thirty-nine varieties of chicken (and one Guinea Fowl) . There are hundreds of chicken breeds in existence. [1] Domesticated for thousands of years, distinguishable breeds of chicken have been present since the combined factors of geographical isolation and selection for desired characteristics created regional types with distinct physical and behavioral traits passed on to ...
An outbreak of highly pathogenic avian influenza has led to the destruction of 786,600 broiler chickens at a Tulare County ranch, marking the second poultry outbreak in about a month in the ...
This is a list of chicken breeds usually considered to originate in Canada and the United States. [1] [2] Some may have complex or obscure histories, so inclusion here does not necessarily imply that a breed is predominantly or exclusively from those countries.
The old hens also have little commercial value. Thus, the main sources of poultry meat a hundred years ago (spring chickens and stewing hens) have both been entirely supplanted by meat-type broiler chickens. Traditionally, chicken production was distributed across the entire agricultural sector.
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