Manganese Deficiency in the Duck

Abstract
The effects of a dietary deficiency of manganese were investigated using ducklings as the experimental subjects. Forty milligrams of manganese per kilogram of diet are adequate for normal growth and prevention of perosis. Alkaline phosphatase activity of liver, kidney, heart and plasma was reduced during the deficiency. The decreased enzyme activity could not be correlated with the presence of an inhibitor or an altered pH optimum of alkaline phosphatase.