Enriched colony cages were introduced in the EU as a compromise between battery cages and full cage-free systems. Evaluating their welfare performance reveals important lessons about incremental reform.
Enriched colony cages represent the welfare policy dilemma of incremental improvement: they are meaningfully better than what they replaced, yet fall well short of what hens need to live good lives. The nest box and perch allow some natural behavior — nesting is a strong behavioral motivation in hens, and its frustration in battery cages caused significant suffering. But the space constraints in enriched cages still prevent wing-flapping, dust-bathing (a strong behavioral priority), and the social dynamics that emerge in more spacious settings. The welfare science suggests enriched cages as a transitional improvement rather than an endpoint — valuable as a step toward cage-free systems, not as a permanent welfare solution. Their regulatory acceptance as a middle ground has, in some cases, slowed the transition to genuinely higher-welfare systems.