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Effects of feeding second generation insect-protected transgenic corn (MON 89034) on growing steer performance was evaluated in two experiments. In Experiment 1, a corn silage-based diet was fed to growing steers in pens, and the transgenic test hybrid was compared to a non-transgenic parental hybrid and two commercially available reference hybrids. In Experiment 2, steers grazing corn residue of the transgenic test hybrid were compared to steers grazing a non-transgenic parental hybrid. In both experiments, growing performance was not affected by source of corn silage or residue.