The deficiency of manganese causes in poultry a disease known as

The deficiency of manganese causes in poultry a disease known as Perosis.
Perosis a disorder of poultry that is characterized by leg deformity and is caused by a deficiency of vitamins (such as biotin or choline) or minerals (such as manganese) in the diet, called also hock disease, slipped tendon.
It is a disorder of chicks, turkey poults, and young swans, characterized by enlargement of the hock, twisted metatarsi, and slipped tendons; it can be largely eliminated by adding manganese and choline to the diet.