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Cobalt in Cows' Milk¹

Massachusetts Agricultural Experiment Station, Amherst

ABSTRACT

Cobaltous acetate was fed as a supplement (500 mg. daily) to the rations of eight cows for a period of 2 months by the double reversal method and the milk was analyzed for cobalt. The results revealed that feeding the supplement consistently raised the amount of cobalt in the milk. The average increase was four-fold. The milk from cows receiving the supplement averaged 2.4 µg. of cobalt per liter in contrast with 0.6 µg. per liter when the cows were on the control ration. The possible significance of the results is discussed briefly.

Acknowledgment is made of valuable help and suggestions from Drs. K. C. Beeson and G. H. Ellis of the United States Plant, Soil, and Nutrition Laboratory, Ithaca, N. Y., in connection with the search for a satisfactory method for determining such extremely small amounts of cobalt.

¹ Contribution no. 616 of the Massachusetts Agricultural Experiment Station.