perosis
noun
pe·ro·sis
pə-ˈrō-səs
plural peroses
-ˌsēz
: a disorder of poultry that is characterized by leg deformity and is caused by a deficiency of vitamins (as biotin or choline) or minerals (as manganese) in the diet
called also hock disease, slipped tendon
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Merriam-Webster unabridged
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