Enriched colony cages were introduced as a higher-welfare alternative to conventional battery cages in the EU, but animal welfare scientists continue to debate whether they meet hens basic behavioural needs.
Enriched colony cages represent a regulatory compromise between conventional cages and cage-free systems that welfare science increasingly suggests is insufficient. The physical elements required by EU law — perch, nest box, scratching area — are present but often inadequate in the available space for hens to actually use them in species-typical ways. Dustbathing, which is a motivated behaviour in hens, cannot be properly performed in cages regardless of enrichment provision. The welfare improvement over conventional cages is real but limited. Consumer demand for cage-free and certified higher-welfare eggs continues to drive market transition beyond what legislation requires.