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Diseases of Poultry
By Ivan Dinev, DVM, PhD
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THYPERKERATOSIS
501.502. A local form of hyperkeratosis in an ostrich. Increased amount of keratin in the horny tissues - down, feathers and beak - is present, resulting in their coarse appearance. The state is linked to impaired metabolism of sulfur-containing amino acids, vitamin A deficiency etc.
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