Keel Bone Fracture Prevention: Design and Management Solutions

Keel bone fractures affect the majority of laying hens in aviary systems — research into prevention through housing design, breed selection and management is producing practical solutions.

Key Facts

Keel bone fractures affect 50-80% of hens in EU cage-free aviary systems — a welfare problem at enormous scale
Tiered aviary systems with ramps rather than direct perch-to-perch jumps reduce fracture rates significantly
Padded perches reduce collision impact and fracture incidence in research trials by 15-25%
Slower-growing strains with lower calcium mobilisation demands show lower keel bone fracture prevalence
Access to perches from a young age (chick stage) develops bone density and reduces fracture risk in adults

Welfare Considerations

Keel bone fractures represent the most significant welfare problem unique to cage-free aviary systems — a reminder that moving beyond cages is necessary but not sufficient for good hen welfare. The research response has been practical and productive: aviary design modifications, padded perch materials, breed selection, and early perch access all reduce fracture rates with measurable effect. These solutions are available; the challenge is implementing them as industry standards rather than exceptional practice. Welfare certification schemes that include keel bone fracture monitoring are beginning to create market incentives for adoption.

What You Can Do

Choose egg brands certified to welfare standards that specify keel bone fracture monitoring and management
Support research funding for aviary design optimisation that reduces landing impact forces on hens
Advocate for keel bone fracture rates to be a mandatory, publicly reported welfare metric for all laying hen producers
Engage with producers about the production quality benefits of reducing keel fracture rates — lame hens lay fewer eggs
Support breed society programmes prioritising structural bone quality alongside production traits in laying hen selection