To determine if carcass composition was affected by nutritional treatment, proportional weight of LM, subcutaneous fat and bone were calculated from the whole rib block that was collected from each carcass. Pre-partum protein concentration did not affect the percentage of LM (P = .29; Table 3), subcutaneous fat (P = .55) or bone (P = .75); however the subcutaneous fat to LM ratio tended (P = .08) to be greater in LP steers compared to HP steers in the current experiment.