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Adding Synergy2 to a corn-based finishing diet to provide 1.12% lipid did not significantly increase steer performance in this trial or in pooled results between this trial and one reported in 1995. However, numerical increases were observed in daily gain and feed dry matter intake for Synergy when compared to control values. Pooled results for additions of pork fat (white grease) to provide 1.12 or 2.24% lipid were intermediate to those for the control and Synergy treatments. Any performance benefit attributed to Synergy may be as much from its effect on dry matter intake as it is from nutrient addition.