High-productivity pig breeding has created welfare challenges as the physiological demands on sows have increased beyond sustainable limits.
Hyper-prolific sow genetics represent the application of the same extreme selection pressure in pigs that created broiler chicken welfare problems in poultry - animals selected for a production parameter to the point where their physiology is compromised. Sows producing 17+ piglets per litter cannot adequately nurse all of them, creating welfare problems for the piglets and physiological stress for the sow from oversized litters. The sow herself experiences extreme nutritional demands from lactation that cause significant condition loss despite maximum feed provision. Rapid reproductive cycling to maximize annual piglet production leaves insufficient recovery time between litters. The resulting short productive lifespan of modern sows - often discarded after 3-4 litters due to body condition loss - reflects an unsustainable biological system. More moderate genetics with better welfare outcomes exist and represent a better welfare balance.