The Relation of Manganese to Congenital Debility

Abstract
In an endeavor to determine the cause of the high infant mortality of milk-fed rats, reproduction, lactation and the manganese content of the young at birth, at weaningand there, after at various periods to sexual maturity have been compared in animals receiving Guernsey milk plus copper and ironwith those receiving the same ration fortified with manganeseas well as with stock fed animals. The lactating ability of the animals receiving the simple milk ration was specifically tested by exchanging their young for vigorous stock young. In a number of instances where the young of the milk-manganese low animals diedthey also were given stock young to raise. Records were kept of the amount of milk consumed by each animal during lactation. The results of the investigation point to the following conclusions:

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