Performance of Growing and Finishing Steers Fed Roasted Soybean Meal

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Abstract
Performance data were collected from four feedlot trials designed to compare roasted soybean meal (RSBM) to nonroasted soybean meal (SBM) as a source of supplemental protein. Solvent-extracted SBM was obtained from a commercial processor, and a portion roasted to 144 C. In trials 1, 2 and 3 steer calves were fed diets formulated to contain approximately 65% TDN (total digestible nutrients, dry basis) using corncobs and high moisture shelled corn or corn silage as primary ingredients. In trial 4, yearling steers were fed a 92% concentrate diet. In trial 1, 144 steers (224 kg, avg initial wt) were fed diets formulated to contain two levels of crude protein (CP), 10 or 11.5% (dry basis) to which SBM and RSBM were added as sources of supplemental protein. Daily gain (DG) and dry matter intake (DMI) were increased (P<.01 and P<.03, respectively) and feed/gain (F/G) was decreased (P<.01) by feeding diets containing 11.5% CP. Roasting did not affect these measurements at either level of CP. In trial 2, 96 steers (223 kg, avg initial wt) were fed SBM, RSBM or RSBM in combination with two forms of methionine (D-L or encapsulated) as sources of supplemental protein. Performance measurements (DG, DMI, F/G) were not influenced (P<.05) by either roasting or form of methionine. In trial 3, 138 steers (231 kg, avg initial wt) were fed SBM, RSBM, corn gluten meal (CGM), isolated soy protein (ISP) or CGM + SBM as sources of supplemental protein. In trial 4, 144 steers (291 kg, avg initial wt) were fed two levels of Ca (.4 or .8%) in combination with three N sources (urea, SBM or RSBM). Performance measurements were not influenced (P<.05) by Ca level or nitrogen source. These data suggest that roasting SBM is not effective in improving steer performance under the dietary conditions imposed in this series of trials. Copyright © 1983. American Society of Animal Science . Copyright 1983 by American Society of Animal Science.