Broiler breeder birds - the parents of meat chickens - are subject to severe feed restriction to prevent obesity, causing chronic hunger that welfare scientists consider one of poultry farming's worst harms.
Feed restriction in broiler breeders is arguably one of the most severe welfare problems in commercial poultry. Birds are genetically programmed to eat at high rates, and restriction creates a state of chronic hunger that may persist for months. Stereotypic behaviors and aggressive competition at feeders indicate significant suffering. Transitioning to slower-growing breeds reduces the restriction needed and represents the most meaningful welfare improvement.