Duroc sires are utilized most frequently as a Terminal/Paternal sire in a terminal cross-breeding program. They sire market pigs that excel in durability, growth, and muscle qualities attributes, and are competitive with other industry sires for carcass leanness and feed efficiency. Duroc boars are the predominate Terminal sire used in the world and provide 100% heterosis when mated to Yorkshire X Landrace F1 females. Some systems utilize a commercial parent stock female that is 25% Duroc to improve robustness and longevity in their sow herds.