Laying Hen Keel Bone Fractures: A Welfare Crisis in All Systems

Keel bone fractures affect an estimated 50-80% of laying hens and cause chronic pain. The problem occurs across all housing systems including free-range and organic, demanding new solutions beyond housing reform.

Key Facts

Keel bone fractures affect approximately 50-80% of commercial laying hens regardless of housing system
The keel bone (sternum) is essential for wing attachment and flight muscle support
Fractures typically occur during falls from perches or collisions with housing structures
Bone density is reduced by calcium mobilization for eggshell production over multiple lay cycles
Hens with keel bone fractures show altered behavior including reduced perch use and changed resting positions
Pain assessment using Grimace Scale adaptations confirms keel bone fractures cause significant pain
Genetic selection for stronger bones while maintaining production has shown promise but is not yet widespread
Perch design modifications including padded perches and gradual gradients reduce fracture rates in some studies

Welfare Considerations

Keel bone fractures reveal a welfare problem that cannot be solved by simply improving housing systems. The transition from battery cages to free-range and enriched colony housing reduced some welfare problems while creating new ones - hens with the ability to fly and jump sustain keel bone fractures from falls that caged hens never experience. The welfare implications are significant: a majority of laying hens in any production system experience chronic pain from keel bone fractures during their productive lives. Solutions require genetic approaches (breeding for stronger bones), environmental design (perch systems that reduce high-speed collisions), and nutritional management (optimizing bone density while maintaining lay). The problem demands sustained research investment because it cannot be legislated away through housing reform alone.

What You Can Do

Support research into keel bone fracture reduction through genetics, housing design, and nutrition
Choose eggs from producers who report keel bone fracture prevalence and are working to reduce it
Advocate for keel bone fracture monitoring as a required welfare outcome measure in egg production
Reduce egg consumption or shift to producers with documented welfare improvement programs
Support extension of welfare research funding to address welfare problems in all housing systems