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The sex-linked slow-feathering gene can be used for crosses where the sex of the chicks can be determined at hatching time by the length of the wing feathers. A cross between a fast-feathering male and a slow-feathering female results in offspring where the female chicks have primary wing feathers that are significantly longer than the coverts ...
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.
Chick. In poultry farming, in-ovo sexing is a chick sexing method carried out while chicks are still in ovo (Latin for "inside the egg"). There are various methods to determine a chick's sex in the 21-day incubation period before it hatches. In-ovo sexing technology has branched into two categories, invasive and non-invasive.
Short feathers covering the base of the main tail feathers in cocks, and most of the tail in hens Vulture hocks Stiff feathers projecting downwards behind the leg only in some breeds Wing bar Short feathers covering the base of the secondaries and of the flight coverts Wing bow coverts Short feathers covering the upper part of the wing between ...
It had been early established that hen-feathering is a trait controlled by a simple autosomic dominant gene, whose expression is limited to the male sex. [ 3 ] [ 4 ] [ 5 ] The genetic symbol proposed by F. B. Hutt in 1958 to designate this autosomic dominant gene was Hf (after "hen feathering") [ 6 ] which was accepted by other geneticists. [ 7 ]
The marked difference between male and female chicks is due to gene dosage of the sex-linked barring gene ('barring' (B), 'nonbarring' (b+)). [5] [6] This gene is located on the Z-Chromosome of birds. Birds have different sex-chromosomes (Z and w) and a different sex-determination system compared to mammals (X and Y). Male birds have therefore ...
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Sex-linked barring is a plumage pattern on individual feathers in chickens, which is characterized by alternating pigmented and apigmented bars. [1] The pigmented bar can either contain red pigment ( phaeomelanin ) or black pigment ( eumelanin ) whereas the apigmented bar is always white.