The genetic selection of commercial broiler chickens for rapid growth causes serious welfare problems. Understanding the evidence helps consumers and policymakers demand better standards.
Breed selection is the root cause of multiple concurrent welfare problems in commercial broiler production. When growth rate is the primary selection criterion, skeletal development cannot keep pace with muscle mass gain. The result is a bird whose legs and cardiovascular system are chronically unable to support its abnormally rapid growth. Gait impairment means affected birds rest more, access feed and water less effectively, and lie on wet litter — causing contact dermatitis that compounds their welfare burden. Switching to slower-growing breeds with better musculoskeletal health addresses the root cause rather than managing individual symptoms. The welfare gain from breed transition is well-documented and substantial; the cost premium is real but modest relative to the welfare improvement achieved.