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A Further Study of the Factor in Soybeans Affecting the Vitamin a Value of butter¹

Research Chemical Laboratory and Department of Dairy Husbandry, Purdue University' Agricultural Experiment Station, Lafayette, Indiana

ABSTRACT

1. Further studies have been made of the vitamin A suppressing factor in soybeans which interferes with the transference of the vitamin A activity of the feed to the butterfat secreted by dairy cows.
   
2. This factor was found to be distributed in both the soybean oil and soybean oil meal secured by either the expeller process or by chemical solvents.
   
3. The suppressing action is not due to the presence of oil in the ration but to some factor in soybean oil in the bean.
   
4. Prolonged extraction of soybeans first with ethyl ether and then with ethyl alcohol failed to completely remove this factor.
   
5. The inability of alcohol to extract the factor from fat free soybean oil meal indicates that it is not soluble in ethyl alcohol.
   

¹ Published with the approval of the Director of the Purdue University Agricultural Experiment Station