Beef cuts are obtained from carcasses of heifers and steers8 less than 30 months of age which have only been fed a diet, for at least the last 100 days before slaughter, containing not less than 62 % of concentrates and/or feed grain co-products on a dietary dry matter basis, that meets or exceeds a metabolisable energy content greater than 12,26 mega joules per one kilogram of dry matter.