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Micronized Sorghum Grain. I. Influence on Feedlot Performance of Cattle^{1, 2,}

Oklahoma State University⁴, Stillwater 74074

Abstract

Three feedlot trails involving 64 steers and 30 heifers were conducted to study micronized sorghum grain for finishing cattle. Trials 1 and 2 compared micronized (MS) to dry rolled sorghum (DRS), and trial 3 compared three densities of MS (232, 322 and 412 g/l) to DRS. Evaluation was based on feedlot performance, carcass merit and volatile fatty acid analysis in trials 1 and 2, and included net energy (NE_m and NE_g) in trial 3.

In trial I, MS produced an improved feed efficiency (feed/kg gain) (P< .10) with no significant differences in gain or feed intake. In trial 2, intake was lower (P< .10) on MS with no significant difference in gain or efficiency. In trial 3, there were no significant differences for intake, gain or feed conversion. In all three trials, the cattle fed MS showed a consistent trend to consume less feed, but gain at the same rate, showing an improved feed efficiency. Net energy values in trial 3 favored the MS treatments.

¹ Journal article 2782 of the Agricultural Experiment Station, Oklahoma State University, Stillwater.

² The assistance of Roger Johnson in statistical analysis is greatly appreciated.

³ Present address: Ralston Purina Co., Oklahoma City, Oklahoma.

⁴ Department of Animal Sciences and Industry.