An animal ribcage primal cut having a bone array located therein is portioned into one or more sub primal cuts, each having at least one bone located therein. The primal cut is scanned at scanning station 14 while being conveyed on a conveyor 12 to determine the physical characteristics of the primal cut. A processor 18 determines how to portion the primal cut into desired sub primal cuts in accordance with desired physical characteristics of the sub primal cut and production requirements for the sub primal cuts. A controller controls a cutter to divide the primal cut into one or more sub primal cuts according to the determination previously made on how to portion the primal cut into desired sub primal cuts.