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The Welsummer or Welsumer is a Dutch breed of domestic chicken. It originates in the small village of Welsum, in the eastern Netherlands. It was bred at the beginning of the twentieth century from local fowls of mixed origin: Rhode Island Reds, Barnevelders, Partridge Leghorns, Cochins, and Wyandottes. In 1922–23, steps were taken to fix a ...
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 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 Plymouth Rock was included in the first edition of the American Standard of Perfection of the new American Poultry Association in 1874. [2] The barred plumage pattern was the original one; other colors were later added. [2] It became the most widespread chicken breed in the United States and remained so until about the time of World War II. [2]
Figure 1. Feathering types in ten-day-old chicks.Left: Fast normal-feathering chick. Right: Delayed-feathering chick carrying sex-linked K gene. Delayed-feathering in chickens is a genetically determined delay in the first weeks of feather growing, which occurs normally among the chicks of many chicken breeds and no longer manifests itself once the chicken completes adult plumage.
The ISA Brown is a crossbreed of chicken, with sex-linked coloration.It is thought to have been the result of a complex series of crosses including but not limited to Rhode Island Reds and Rhode Island Whites, and contains genes from a wide range of breeds, the list of which is a closely guarded secret. [1]
Pullet: a young female chicken less than a year old. [10] In the poultry industry, a pullet is a sexually immature chicken less than 22 weeks of age. [11] Rooster: a fertile adult male chicken, especially in North America. Originated in the 18th century, possibly as a euphemism to avoid the sexual connotation of the word cock. [12] [13] [14]
One-day-old chicks arriving to be unpacked and placed in shed Young birds being reared in a closed broiler house. Artificial selection has led to a great increase in the speed with which broilers develop and reach slaughter-weight. The time required to reach 1.5 kg (3 lb 5 oz) live-weight decreased from 120 days to 30 days between 1925 and 2005.