Animal Husbandry Pamphlet 3
Vitamin A is essential for all cattle. The vitamin does not occur naturally in feeds of plant origin. Many cattle are never fed vitamin A as such but do not develop a deficiency of the vitamin. The reason for this is that many feeds (pasture, good quality hay, silage, and yellow com) furnish carotene which is converted to vitamin A in the animal body.
Number of Pages
South Dakota Agricultural Experiment Station
Embry, L.B. and Kortan, L.J., "Vitamin A in Beef Cattle Feeding" (1969). Agricultural Experiment Station Animal Husbandry Pamphlets. 1.