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The Effect of Feeding a Cod-Liver Oil Concentrate to Cows on the Vitamin D Content of Milk

Departments of Dairy Industry and Animal Industry, Ohio Agricultural Experiment Station, Wooster

ABSTRACT

When a cod-liver oil concentrate (Vitex) was fed to cows the vitamin-D content of the milk increased as the amount of Vitex fed increased. When an ordinary dairy ration was fed the milk contained less than 2.76 Steen-bock rat units of vitamin D per quart; when 60,000 rat units of vitamin D as Vitex were fed the milk contained 30.35 rat units per quart—at least an eleven-fold increase.

On this basis, the feeding of Vitex to cows for the purpose of increasing the vitamin D content of milk is too costly.

At least 60,000 rat units of vitamin D as Vitex may be fed to cows daily without affecting the physical condition or producing ability of the animals.