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Autosexing
Auto-sexing breeds of poultry are those in which the sex of newly-hatched chicks can be determined from the colour and markings of the down. Some breeds of chicken, of goose and of domestic pigeon have this characteristic. The idea of such a breed is due to Reginald Punnett, who created the first auto-sexing chicken breed, the Cambar, at the Genetical Institute in Cambridge in 1928. Mechanism Unlike sex-linked hybrids, such as 'red sex-links' or 'black sex-links', the Legbar is an auto-sexing breed. Several other auto-sexing breeds or auto-sexing varieties of breeds exist, such as Plymouth Rock, Bielefelder Kennhuhn, Niederrheiner, and Norwegian Jærhøns. Most breeds that end with -bar, such as Welbar, Rhodebar, Brussbar or Wybar, are auto-sexing as well. The importance that auto-sexing plays in the Legbar breed is also reflected in the fact that, next to a standards for the adult birds, the down colour and patterns are also standardised. Day-old male chicks can be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legbar
The Legbar is a rare British auto-sexing breed of chicken. It was created in the early twentieth century by Reginald Crundall Punnett and Michael Pease at the Genetical Institute of Cambridge University. They cross-bred American barred Plymouth Rock birds with brown Leghorns and created the gold and silver colour varieties. Pease created a cream Legbar by cross-breeding these with white Leghorns; later crossing with Araucanas caused this to have a crest and to lay blue or blue-green eggs. History The Legbar was the second auto-sexing chicken breed created by Reginald Crundall Punnett and Michael Pease at the Genetical Institute of Cambridge University, after the Cambar, which was created in 1929 by crossing barred Plymouth Rock with gold Campine birds. The Legbar arose from cross-breeding of Plymouth Rock birds with brown Leghorns, which at that time were two of the principal egg-laying breeds. As with the Cambar, they set out to breed a bird that would both have brown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambar
The Cambar is the first autosexing breed of chicken intentionally created, and the first autosexing breed of poultry in general. The Cambar was developed by Reginald Punnett and Michael Pease in 1929. The Cambar was a mixture of the Barred Plymouth Rock and the Gold Campine. History The Cambar was first shown at the Third World Poultry Congress in 1930.{{Cite web , title=Autosexing: Cambar ‐ The Poultry Club , url=http://www.poultryclub.org/breeds/chickens/soft-feather-light/autosexing-cambar/ , access-date=2023-03-25 , website=www.poultryclub.org The breed was standardized in 1947. See Also *Legbar The Legbar is a rare British auto-sexing breed of chicken. It was created in the early twentieth century by Reginald Crundall Punnett and Michael Pease at the Genetical Institute of Cambridge University. They cross-bred American barred Pl ... *Bielefelder References External LinksPhoto Gallery Chicken breeds Auto-sexing chicken breeds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breed
A breed is a specific group of domestic animals having homogeneous appearance (phenotype), homogeneous behavior, and/or other characteristics that distinguish it from other organisms of the same species. In literature, there exist several slightly deviating definitions. Breeds are formed through genetic isolation and either natural adaptation to the environment or selective breeding, or a combination of the two. Despite the centrality of the idea of "breeds" to animal husbandry and agriculture, no single, scientifically accepted definition of the term exists. A breed is therefore not an objective or biologically verifiable classification but is instead a term of art amongst groups of breeders who share a consensus around what qualities make some members of a given species members of a nameable subset. Another point of view is that a breed is consistent enough in type to be logically grouped together and when mated within the group produce the same type. When bred together, ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plymouth Rock (chicken)
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. It is a dual-purpose chicken, raised both for its meat and for its brown eggs. It is resistant to cold, easy to manage, and a good sitter. History The Plymouth Rock was first shown in Boston in 1849, but was then not seen for another twenty years. In 1869, in Worcester, Massachusetts, one D.A. Upham cross-bred some Black Java hens with a cock with barred plumage and a single comb; he selectively bred for barred plumage and clean (featherless) legs. His birds were shown in Worcester in 1869; the modern Plymouth Rock is thought to derive from them. Other people have been associated with the development of the Plymouth Rock, as have other chicken breeds including the Brahma, the Cochin (both white and buff), the Dominique, and the White-faced Black S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golden Campine
The Campine is a breed of domestic chicken originating in the northern part of Belgium. It is named for the Campine region of north-eastern Belgium and south-eastern Netherlands. It was known there as the Kempisch Hoen. History The Campine was originally a smaller type of the Braekel, weighing up to less. It was distributed throughout the province of Antwerp and in the northern and central part of the province of Limburg. It was decided in 1884 that the two types should be separated. After a long controversy, the Campine became a separate breed with its own breed standard on 28 August 1904. After further controversy, the two breeds were reunited under a single standard in 1925 or 1926, with the name Kempisch-Braekel. In 1962 it was decided that the Campine type had entirely disappeared, and the name of the Belgian breed was changed to Brakelhoen. The Campine was imported to England in about 1899, and was bred there to become a very different bird. In particular, hen featherin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michael Pease
Michael Stewart Pease OBESupplement to the London Gazette 11 June 1966, p6542 (2 October 1890 – 27 July 1966) was a British classical genetics, classical geneticist at Cambridge University. Michael Pease was the son of Edward Reynolds Pease, writer and a founding member of the Fabian Society, of the Pease family of Quakers. He was educated at Bedales School and Trinity College, Cambridge, where he was elected chairman of the Cambridge Universities Labour Club, Cambridge University Fabian Society. On 24 February 1920 he married Helen Bowen Wedgwood, daughter of the Labour politician Josiah Wedgwood IV (later 1st Baron Wedgwood), of the Wedgwood pottery family at Chelsea Register Office. Their children include the physicist Bas Pease and Jocelyn Richenda Gammell Pease (1925–2003), who married the Nobel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University
, mottoeng = Literal: From here, light and sacred draughts. Non literal: From this place, we gain enlightenment and precious knowledge. , established = , other_name = The Chancellor, Masters and Scholars of the University of Cambridge , type = Public research university , endowment = £7.121 billion (including colleges) , budget = £2.308 billion (excluding colleges) , chancellor = The Lord Sainsbury of Turville , vice_chancellor = Anthony Freeling , students = 24,450 (2020) , undergrad = 12,850 (2020) , postgrad = 11,600 (2020) , city = Cambridge , country = England , campus_type = , sporting_affiliations = The Sporting Blue , colours = Cambridge Blue , website = , logo = University of Cambridge logo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex-link
Sex-links are crossbred chickens whose color at hatching is differentiated by sex, thus making chick sexing an easier process. Sex-links come in several varieties. As hybrids of laying or dual-purpose breeds infused with extra vigor via heterosis, sex-links can be extremely good egg-layers which often produce 300 eggs a year or more depending on the quality of care and feed. The color of their eggs vary according to the mix of breeds, and blue-green eggs are possible. Chicks of a single breed that are similarly sex-linked are called autosex chickens, a term developed to differentiate between sex linkage in purebred chickens versus sex linkage in crossbreeds. Sex-link types Many common varieties are known as the black sex-link (also called black stars) and the red sex-link (also called red stars). More specific variety names are common as well. * Black sex-link like "Black rocks" are a cross between unique specially bred hybrid strains of Rhode Island Red rooster (but any non-w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cross-breeding
A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. ''Crossbreeding'', sometimes called "designer crossbreeding", is the process of breeding such an organism, While crossbreeding is used to maintain health and viability of organisms, irresponsible crossbreeding can also produce organisms of inferior quality or dilute a purebred gene pool to the point of extinction of a given breed of organism. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is known, may also be called a crossbreed though the term "mixed breed" is technically more accurate. Outcrossing is a type of crossbreeding used within a purebred breed to increase the genetic diversity within the breed, particularly when there is a need to avoid inbreeding. In animal breeding, ''crossbreeds'' are crosses within a single species, while '' hybrids'' are crosses between different species. In plant breeding terminology, the term ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
First World War
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in genocides within the Ottoman Empire and in the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising France, Russia, and Britain) and the Triple Alliance (containing Germany, Austria-Hungary, and Italy). Tensions in the Balkans came to a head on 28 June 1914, following the assassination of Archduke Franz Ferdina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genotype
The genotype of an organism is its complete set of genetic material. Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location. The number of alleles an individual can have in a specific gene depends on the number of copies of each chromosome found in that species, also referred to as ploidy. In diploid species like humans, two full sets of chromosomes are present, meaning each individual has two alleles for any given gene. If both alleles are the same, the genotype is referred to as homozygous. If the alleles are different, the genotype is referred to as heterozygous. Genotype contributes to phenotype, the observable traits and characteristics in an individual or organism. The degree to which genotype affects phenotype depends on the trait. For example, the petal color in a pea plant is exclusively determined by genotype. The petals can be purple or white depending on the alleles present in the pea plant. Howev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
