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A 2×3 factorial design was utilized to ascertain the effects of three dietary crude protein (CP) concentrations on performance, carcass characteristics, and serum urea nitrogen (SUN) concentration in steers and heifers. Animals were blocked by gender (n=9) and body weight (BW; n=3/gender), randomly assigned to a diet containing 110, 125 or 140g/kg dietary CP (n=6), subjected to a growing period of...