According to the SEUROP carcass classification system, double-muscled slaughter bulls of the Belgian Blue beef breed (DM-BBB) are usually classified either as "E" or as "S" carcasses. The large differences in price paid on the market for these two types cannot be explained on the basis of differences in carcass lean meat content resulting from standard dissection methods. In this study, commercial dissection was applied to evaluate the differences between “S” and “E” carcasses. It was concluded that the differences in the proportion of high and low quality meat could not explain the large price differentials. Other factors than carcass composition (size and shape of cuts, meat quality traits) are thus involved.