The Quantitative Requirement of the Growing Chick for Manganese

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Abstract
These experiments were designed to determine the level of manganese most satisfactory for growth and for the prevention of perosis. An all-mash ration containing 6 or 7 ppm. of manganese was supplemented with manganese sulfate. A minimum of 30 ppm. of manganese added to the basal ration used was necessary for good growth and for the prevention of slipped tendons. Lower quantities allowed the incidence of an appreciable percentage of slipped tendons. The degree of bowing of the legs was inversely proportional to the content of manganese in the feed up to about 30 ppm. As much as 646 ppm. was not toxic.