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Post-legged describes a condition in which the joints in an animal are not set correctly. When an animal is post-legged, the leg joints are far too straight, with almost no bend in the legs. Four-legged animals must have some bend in the hocks, otherwise the hooves would wear unevenly, and this may result in lameness, or at least a rougher gait.
Cats are commonly cow-hocked, with the hind legs angling inward at the ankles and the feet splaying outward more than forward. Mild cow-hocking is negligible, and kittens often look a little cow-hocked, but if the defect is severe, the resulting poor alignment can damage the joints and spine. [2]
Feather Description Image Notes Beard Feathers projecting below the beak only in bearded breeds Crest Feathers projecting upwards from the head
Fibromelanosis is also found in some other black or blue-skinned chicken breeds, such as the Silkie. [6] [7] The roosters weigh 2–2.5 kg (4.4–5.5 lb) and the hens 1.5–2 kg (3.3–4.4 lb). The hens lay tinted or cream-colored eggs, although they are poor setters and rarely hatch their own brood. Eggs weigh an average of 45 g (1.6 oz).
The physical traits used to distinguish chicken breeds are size, plumage color, comb type, skin color, number of toes, amount of feathering, egg color, and place of origin. [1] They are also roughly divided by primary use, whether for eggs, meat, or ornamental purposes, and with some considered to be dual-purpose. [1]
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.
Naked Neck chickens. Despite its highly unusual appearance, the breed is not particularly known as an exhibition bird, and is a dual-purpose utility chicken. They lay a respectable number of light brown eggs, and are considered desirable for meat production because they need less plucking and they have a meaty body.
In countries in North America and western Europe, where use of cow's milk based infant formula is common, chicken egg allergy is the second most common food allergy in infants and young children after cow's milk. [9] [8] [54] However, in Japan, egg allergy is first and cow's milk second, followed by wheat and then the other common allergenic ...