Yearling beef steers averaging 775 lb. were fed a low-carotene diet during a 106-day finishing experiment to compare methods of vitamin A supplementation. The diets consisted of a full feed of whole corn grain and 2 lb. of chopped alfalfa-bromegrass hay. Methods of vitamin A supplementation were (1) vitamin A in a supplement fed at 1 lb. per steer daily (20,000 IU), (2) vitamin A in a mineral mixture (544,800 IU per lb.) offered to the cattle on a free-choice basis and (3) vitamin A as an instramuscular injection of 3 million IU at the start of the trial. The injections were administered to part of the steers that received vitamin A in the daily supplement and the vitamin in the free-choice mineral supplement.
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Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Luther, R. M.; Embry, L. B.; and Giles, J. F., "Methods of Supplementing Vitamin A to Fattening Beef Cattle" (1980). South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1980. 2.