Studies of a Manganese-Iron Antagonism in the Nutrition of Rabbits and Baby Pigs

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Abstract
Four experiments, one with mature anemic rabbits and three with anemic baby pigs, were conducted. Excessive manganese in the diet, 2000 p.p.m., depressed hemoglobin formation in both rabbits and baby pigs. The minimal level of manganese in the diet that interfered with hemoglobin formation was estimated to be between 50 and 125 p.p.m. A supplement of 400 p.p.m. of the iron in the diet overcame the depressing effect of 2000 p.p.m. of manganese on the hemoglobin formation of baby pigs. A supplement of either 1250 or 2000 p.p.m. of manganese in the diet also depressed growth.

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