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Effect of Varying Milo-Barley Levels, Ration Preparation and Intraruminal Injections of Vitamin A upon Feedlot Performance of Steers¹

Oregon Agricultural Experiment Station, Corvallis

Abstract

One-hundred-eight yearling steers were fed three levels of milo and barley prepared by three different methods (coarse grind, steam rolled, and fine grind-pelleted), resulting in a total of nine different treatments. Paired animals with a common previous environment were selected from each pen. One was injected intraruminally with 1,000,000 I.U. of vitamin A initially and the other served as a control. The rations that were finely ground and pelleted significantly reduced the average daily gain as compared to the coarse grind or steam rolling preparation. No other significant differences were noted for such criteria as feed efficiency, dressing percent, marbling score, back fat, U.S.D.A. grade or yield grade. These data suggest that when vitamin A supplementation is required, method of feed preparation should be considered. The relationship of feed preparation and vitamin A supplementation warrants further study.

¹ Technical Paper No. 1661, Oregon Agricultural Experiment Station.

² Department of Animal Science.

³ Oregon State Extension Service.