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The Vitamin A Requirements of Dairy Cows for Production of Butterfat of High Vitamin A Value. III. Availability of Carotene in Dehydrated Alfalfa Hay as Compared with Carotene in Oil¹

Departments of Agricultural Chemistry and Dairy Husbandry, Purdue University Agricultural Experiment Station, Lafayette, Indiana

ABSTRACT

1. Experiments have been conducted to determine the relative availability of carotene in dehydrated alfalfa hay as compared with isolated carotene (in oil) as a source of vitamin A in the rations of dairy cows.
   
2. Two groups of cows were used in these experiments. Each group of cows was fed equal amounts of carotene at levels of 130, 200, and 300 milligrams daily.
   
3. The results of these experiments indicate that dairy cows can utilize the carotene from the alfalfa hay as readily as isolated carotene.
   

¹ Journal Paper No. 110 of the Purdue University Agricultural Experiment Station.