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Maintaining the Vitamin A Value of Butter through Winter Feeding Conditions^*

Departments of Dairy Husbandry and Research Chemistry, Purdue University Agriculture Experiment Station, Lafayette, Indiana Experiment Station.

ABSTRACT

1. Experiments have been conducted to determine the relative efficiency of various feeds in maintaining the high vitamin A value of summer produced butters.
   
2. Using samples of pasture produced butter of high vitamin A value as checks, it was found that under winter feeding conditions, timothy hay produced butter of low vitamin A value, while good quality alfalfa hay and soybean hay were very effective in either maintaining the high vitamin A level of butter or in restoring it to normal summer values. Thus it is possible to maintain a high vitamin A value of butter by practical feeding methods.
   
3. From the data presented in these experiments, it is evident that the vitamin A value of butter responds very rapidly to changes in the vitamin A value of the rations fed to the cows.
   

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