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Journal of Dairy Science Vol. 27 No. 1 57-62
© 1944 by American Dairy Science Association ®
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The Vitamin A Requirements of Dairy Cows for Production of Butterfat of High Vitamin A Value. II. Vitamin A Per se*

J. H. Hilton, J. W. Wilbur and S. M. Hauge

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

ABSTRACT

  1. Feeding experiments have been completed to determine the minimum vitamin A requirements of dairy cows for the production of butter of maximum vitamin A value.
  2. When the source of vitamin A in the ration was vitamin A per se (fish liver oil), this requirement was satisfied with a daily intake of 200,000 units.
  3. In this series of experiments, vitamin A per se was found to be approximately three times as effective as carotene in dehydrated alfalfa hay.

FOOTNOTES

* Journal Paper No. 109 of the Purdue University Agricultural Experiment Station.






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