In Table 2 the mean protein content (N 6.25) for each cut in each age group and fat class is presented to illustrate the effect of cut, age and fatness on total protein content calculated from total nitrogen. Protein content differed in two of the 15 cuts with age (topside, shoulder), in five of the 15 cuts with fat code (prime rib, silverside, topside, thick flank and chuck), as well as with the total carcass value. As expected, the protein content in the total carcass (calculated) decreased significantly with an increase in fat code (p 6 0.05).