Fast-growing broiler breeds experience higher rates of leg disorders, cardiac disease and mortality. Slower-growing breeds show significantly improved welfare outcomes.
The welfare burden of fast-growing broiler genetics is one of the most significant in global livestock production by number of animals affected. Leg disorders causing lameness reduce access to food and water, affect comfort and cause chronic pain in a significant proportion of commercially reared birds. Cardiac conditions cause sudden death that is preceded by brief but acute distress. Slower-growing breeds have been developed that maintain commercial viability while dramatically reducing the prevalence of welfare-significant conditions. Consumer and retailer commitments to the Better Chicken Commitment drive breed selection change.