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The Effect of Soybeans in the Rations of Dairy Cows upon the Vitamin A Value of Butter^*

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

ABSTRACT

1. Dairy cows with a constant level of vitamin A intake, produced butter of lower vitamin A value when soybeans were fed in the grain ration than when linseed oil meal was used.
   
2. Soybeans apparently suppress the transference of vitamin A from the ration to the butter.
   
3. The attempt to correct this suppressing action by roasting the soybeans used in the grain ration was unsuccessful.
   
4. Cows fed soybean hay which was harvested after the beans were well formed in the pods, produced butters of somewhat lower vitamin A value than when alfalfa hay was fed.
   
5. Although soybeans have a suppressing action on the formation of vitamin A in the butterfat, yet it is possible to produce butters of fairly high vitamin A value even when soybeans are used in the rations of the cows provided roughage of high vitamin A potency is fed.
   

^* Published with the approval of the Director of the Purdue University Agricultural Experiment Station.