Enriched colony cages replaced conventional battery cages across the EU but provide only marginal welfare improvements and fall significantly short of free-range or barn systems.
Enriched colony cages represent a welfare minimum rather than a welfare solution. The transition from conventional battery cages was a genuine welfare improvement, but the improvement is modest. Hens in enriched cages still cannot spread their wings fully, perform functional dust bathing, express natural foraging behavior across meaningful space, or avoid social stress within densely confined groups. Keel bone fracture rates identical to conventional cage systems indicate that one of the most significant welfare problems in laying hen production has not been addressed by enriched cage design. Consumer and retailer pressure for cage-free commitments, already adopted by many major food companies, represents the minimum welfare standard that meaningfully improves on enriched cages.