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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.
Though all breeds of chickens may be frizzled; it is most commonly seen in breeds such as the Cochin, Pekin, and Polish. [1] Chickens with this pattern are sometimes referred to as frizzles. The gene which causes the frizzles' peculiar feathering is an incomplete dominant trait.
Feather pecking is a behavioural problem that occurs most frequently amongst domestic hens reared for egg production, [1] [2] although it does occur in other poultry such as pheasants, [3] turkeys, [4] ducks, [5] broiler chickens [6] and is sometimes seen in farmed ostriches. [7] Feather pecking occurs when one bird repeatedly pecks at the
The long flight feathers of the inner part of the wing Sickles The two longest curved feathers of the tail only in cock birds Tail coverts 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 ...
Chickens that have contracted runting-stunting syndrome cause a number of individuals in a flock to appear noticeably small due to its delayed growth. Diseased chicks are typically pale, dirty, wet, and may have a distending abdomen. Some individuals may display “helicopter-like” feathers in their wings and other feather abnormalities. [10]
It attacks the feather follicles and the beak and claw matrices of the bird, causing progressive feather, claw and beak malformation and necrosis. In later stages of the disease, feather shaft constriction occurs, hampering development until eventually all feather growth stops. It occurs in an acutely fatal form and a chronic form.
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Pigeon skeleton with "plowshare"-type pygostyle (number 17) Confuciusornis sanctus with "rod"-type pygostyle and the two central tail feathers. Pygostyle describes a skeletal condition in which the final few caudal vertebrae are fused into a single ossification, supporting the tail feathers and musculature.