Cage-Free Hen Transition: Welfare Gains and Ongoing Challenges

The global transition from battery cages to cage-free laying hen systems represents a major welfare improvement in some respects, but introduces new welfare challenges that the industry is still working to address effectively.

Key Facts

Over 500 major food companies globally have made cage-free commitments, driving a significant shift in egg production systems
The EU ban on conventional battery cages implemented in 2012 was a landmark welfare policy change affecting hundreds of millions of hens
Cage-free hens can perform natural behaviours impossible in cages — wing flapping, dust bathing, perching, and foraging — representing genuine welfare improvements
Keel bone fractures — painful injuries to the sternum — affect 50-80% of hens in cage-free systems with poor perch design, compared to lower rates in well-designed enriched cages
Mortality rates in cage-free systems are typically higher than in enriched cages due to increased aggression, disease transmission, and entrapment hazards
Multi-tier aviaries — the dominant cage-free system in Europe — can achieve good welfare outcomes when well-managed but require more sophisticated stockpersonship
Consumer willingness to pay for cage-free eggs has been a key enabler of the transition — but price sensitivity remains a barrier in many markets

Welfare Considerations

The cage-free transition is a genuine welfare improvement that has also introduced genuine welfare problems — a complex reality that requires honest assessment rather than simple celebration or condemnation. Hens in cage-free systems can express a vastly wider behavioural repertoire than those in battery or enriched cages, and this is a meaningful welfare gain. But the keel bone fracture epidemic, higher mortality, and management challenges in some cage-free systems represent real welfare costs that the industry must address rather than dismiss. The lesson is not that cage-free is bad but that the welfare gains from behavioural freedom must be secured alongside solutions to the specific welfare problems that emerge in more complex systems. Evidence-based design, improved stockpersonship, and welfare monitoring are the tools needed to realise the welfare potential of cage-free housing.

What You Can Do

Choose eggs from cage-free or free-range systems with welfare certifications that include monitoring for keel bone fractures and mortality
Ask egg producers and retailers about keel bone fracture monitoring — this welfare outcome measure indicates whether cage-free welfare gains are being realised in practice
Support research into cage-free system design improvements that reduce keel bone fractures and mortality
Advocate for welfare outcome monitoring to be mandatory in cage-free certification schemes
Support campaigns for outdoor access systems (free-range and pasture) as the gold standard for laying hen welfare
Engage with the nuanced welfare evidence rather than treating cage-free as a complete welfare solution