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Zinc in Cows' Milk^*

Department of Animal Husbandry, Massachusetts Agricultural Experiment Station

ABSTRACT

Zinc oxide was fed as a supplement (10 grams per cow daily) to the ration of eight cows for a period of three months by the double reversal method. The milks from the cows were analyzed for their zinc content and it was found that feeding the zinc supplement had consistently raised the level of that element in the milk, the average being 5.1 mgms. of zinc per liter of milk as contrasted with an average of 3.9 mgms. when the cows were on a control ration.

^* Contribution No. 491 of the Massachusetts Agricultural Experiment Station.

¹ Acknowledgment is made to Vernon C. Cole, who did the analytical work under the author's direction.

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