Vitamin A, Corn Silage and Raw Soybeans for Finishing Steers in Drylot

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Abstract
Somewhat contradictory evidence on the needs of beef cattle for dietary vitamin A exists in the literature. Animals on good pasture obtain sufficient carotene to meet their requirements (Chapman et al., 1964; Perry et al., 1966), but findings are quite diverse in respect to needs for supplemental vitamin A in drylot finishing programs. Administration of this vitamin has significantly improved rates of gain (Perry et al; 1962; Perry et al. 1968) but Weichenthal et al. (1963) found that feedlot performance of yearling steers was not improved by supplemental vitamin A. The increasing use of corn silage for beef production suggested the desirability of further evaluation of this material in drylot feeding programs. The work of Jordan et al. (1963) and Smith et al. (1964) suggests a definite inability of carotenes from corn silage to meet the vitamin A requirements of feeder steers. Klosterman et al. (1964) concluded that growing-fattening steers were able to obtain their daily vitamin A requirements from carotene supplied by corn silages. Copyright © 1969. American Society of Animal Science . Copyright 1969 by American Society of Animal Science

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