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The Dominique is an American breed of chicken, characterized by black-and-white barred plumage and a rose comb. It is considered to be the oldest American chicken breed, [8]: 121 and is thought to derive from birds brought to America by colonists from southern England. It was well known by about 1750, and by the mid-nineteenth century was ...
Barred cock and hen, illustration from Jean Bungartz, Geflügel-Album, 1885 Egg. The Plymouth Rock is an American breed of domestic chicken.It was first seen in Massachusetts in the nineteenth century and for much of the early twentieth century was the most widely kept chicken breed in the United States.
The concept of an auto-sexing breed of chicken is due to the geneticist Reginald Punnett, who during the First World War had already proposed the technique of cross-breeding chickens carrying the barred gene (B) with others to produce sex-linked chicks with plumage differences that could easily be distinguished.
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 ...
The B1 allele is causing the typical sex-linked barring phenotype/ appearance and is present in most modern sex-linked barred chicken breeds. Females or male chickens carrying the B2 allele in the heterozygous condition show a defined barring pattern but in the homozygous condition, males are essentially white with very little pigmentation. [9]
In Barred Rock chickens, male chicks tend to have a large and distinct pale spot on the head, while hen chicks have a smaller and less defined spot. This is due to the effects of the incompletely dominant barred (B) gene. [7] Rhode Island Red and New Hampshire Red chicks with chipmunk stripes are almost always females. [8]
Red sex-links are a cross between a Rhode Island Red or New Hampshire rooster and a White Rock (This variety pair is known as a Golden Comet), Silver Laced Wyandotte, Rhode Island White, or Delaware hen. Examples of a red-linked breeds include the Red Shaver and ISA Brown sex-links which are found in Canada. [3]
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.
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