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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 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 ]
Others are gonochores, with individuals being either male or female and never changing sex. Gonochores in this genus are thought to be "secondary gonochores", species with ancestors that were hermaphrodites and lost the ability to change sex. An exception is the barred sand bass (P. nebulifer), which is a gonochore which has retained the ...
Barred Barred Rock Hen Divided into Dark and Light in Australian Plymouth Rocks Crele The cuckoo pattern with black-breasted red pigmentation Silver Cuckoo
This means that phenotypically barred cocks can either have the B/B or the B/b+ genotype, while a barred hen always has to have a B/- genotype. The colour-sexing of Legbar chicks, however, is only possible because the male chicks have a double dose of the sex-linked barring gene (genotype B/B), while the female chicks only have a single dose ...
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.
It was created by Gerd Roth by cross-breeding of birds of Malines and Welsumer stock with American Barred Rock birds. [4] [9]: 95 [10]: 6 It was first exhibited in 1976 as the Deutsche Kennhuhn; in 1980, when the breed was recognised by the Bund Deutscher Rassegeflügelzüchter , the name was changed to Bielefelder Kennhuhn. [10]: 6
It was created between 1946 and 1954 by Laura Kaufman, who crossed the native Polish Green-legged Partridge breed with American Plymouth Rock birds. The aim was to introduce the barred gene of the Plymouth Rock to make chicks auto-sexing – female chicks can be distinguished from males at one day old by the longer black eye-stripe. [2] [3]