The density at which broiler chickens are kept is one of the most influential determinants of their welfare. Understanding stocking density science guides purchasing decisions and policy advocacy.
Stocking density is among the most tractable welfare improvements in broiler chicken production because it has a clear dose-response relationship with welfare outcomes. At maximum commercial densities, chickens cannot all lie down simultaneously and movement is severely restricted. The resulting welfare problems are predictable and extensively documented: footpad dermatitis from wet litter, ammonia burns from inadequate ventilation, difficulty accessing food and water, and increased aggression. Reducing stocking density requires no new technology - just commitment from producers and retailers. Consumer pressure expressed through certification choices has been effective in driving lower density commitments, making this one of the clearest examples of market mechanisms improving farm animal welfare at scale.