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Effect of Raw Soybeans and Soybean Oil Meal on the Vitamin A and Carotene Concentrations in the Blood Plasma and Milk of Lactating Cows¹

Iowa State College, Ames

ABSTRACT

A reduction of the carotene concentration of the blood plasma and of the milk of lactating cows resulted when raw soybeans were fed.

When soybean oil meal was fed in an amount equivalent to that of the raw beans minus their oil content, the carotene concentrations in the blood plasma and the milk fat were similar to those when the cows were fed the control ration.

Both the control and soybean oil meal groups excreted more carotene in their milk than did the group fed raw soybeans.

Loss of these nutrients from the bodies of the cows fed raw soybeans thus was not the cause of the observed reduction of their blood plasma carotene concentration. Apparently soybeans either interfered with carotene absorption or caused some destruction of it.

No significant differences were observed among the groups of cows in the quantity of vitamin A per se in the blood plasma and in the milk during the last 3 weeks of the trial when all the rations were supplemented with 100,000 U.S.P. units of vitamin A daily.

¹ Journal paper no. J964 of the Iowa Agricultural Experiment Station, Ames. Project no. 692.