The breed of broiler chicken profoundly affects its welfare capacity. Slow-growth and dual-purpose breeds offer fundamentally better welfare outcomes than the fast-growing breeds dominating commercial production.
The genetic selection of commercial broiler breeds has created birds that grow so rapidly they are compromised in their ability to perform normal behaviors. Fast-growing breeds spend significantly more time lying down than slow-growth birds because their musculoskeletal system struggles to support their rapidly accumulating breast muscle. Cardiac failure is an industry-accepted mortality cause rather than an exceptional event. Slow-growth breeds demonstrate that productivity and welfare are not inherently in conflict - they achieve acceptable commercial performance while maintaining the capacity for walking, foraging, and social behavior. The welfare gap between standard commercial and slow-growth breeds represents one of the clearest examples of how genetic selection itself creates welfare problems that management improvements alone cannot address.