The genetic selection of broiler chickens for rapid growth has created a welfare crisis affecting over 70 billion birds annually, with many unable to walk, rest comfortably or perform basic natural behaviors.
Broiler chicken welfare represents perhaps the single largest source of avoidable animal suffering in the modern food system by sheer numbers affected. The extreme growth rates achieved through selective breeding cause musculoskeletal disorders so severe that many birds spend extended periods lying in their own waste, developing contact dermatitis and pressure sores. Cardiovascular disease caused by the mismatch between rapid muscle growth and heart development kills millions of birds before slaughter. Fast-growing breeds also show reduced behavioral repertoire, spending less time foraging, perching and dust bathing than slower varieties. Transitioning to slower-growing breeds with improved living conditions is among the highest-impact welfare interventions available to food companies and consumers.