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Substitution of Corn for Forage in the Fattening Ration of Steers¹

Iowa Agricultural and Home Economics Experiment Station, Ames

Abstract

A study was conducted with steers to determine the response to various combinations of bromegrass-alfalfa soilage and corn feeding during the forage growing season followed by the full-feeding of corn for finishing. Rate of gain increased as the level of corn feeding increased. These ratios were fed: (1) all soilage, (2) 20 parts soilage:1 part concentrate, (3) 10 parts soilage:1 part concentrate, (4) 5 parts soilage:¹ part concentrate, (5) 3 parts soilage:¹ part concentrate, and (6) 2 parts soilage:1 part concentrate. Estimated slaughter grades were higher for the steers fed higher levels of corn during the soilage feeding period. The increase in gain due to corn feeding was linear and 1 lb. of corn replaced 8.9 lb. of soilage (on an as-fed basis).

The steers fed all soilage during the soilage feeding period required 88 days longer to reach market than the steers fed the 2:1 ratio of soilage to concentrate.

¹ Journal Paper No. 4157 of the Iowa Agricultural & Home Economics Experiment Station, Ames, Iowa. Project No. 1016.

² Department of Agronomy, University of Wisconsin, Madison, Wisconsin.

³ The authors wish to extend their appreciation to Wise Burroughs, Earl Heady and Paul Homeyer for aid in designing this experiment.