Laying Hen Keel Fracture Genetics and Prevention

Keel bone fractures in laying hens are a major welfare problem across all production systems. Genetic selection for better bone quality offers one of the most promising long-term solutions alongside management improvements.

Key Facts

Keel bone fractures affect 50-80% of laying hens across all commercial production systems
Heritability of keel bone integrity is moderate (around 0.3-0.4) making genetic selection feasible
Some commercial laying hen lines show significantly lower keel fracture rates than others, demonstrating genetic variation available for selection
Hendrix Genetics and other breeding companies have included keel bone integrity in selection indices
Calcium supplementation and optimised phosphorus levels in diet can improve bone mineralisation and potentially reduce fracture risk
Perch design - width, material, and placement - significantly affects collision injuries that contribute to fractures
Lighting management that reduces hyperactivity and collisions can reduce fracture incidence
Welfare Quality assessment includes keel palpation as a standard measure, enabling monitoring across systems

Welfare Considerations

Keel fracture prevention requires simultaneous action on multiple fronts - genetics, housing design, nutrition, and management - because no single intervention is sufficient. The genetic route is particularly promising because it addresses the underlying bone quality issue rather than managing consequences. However, genetic improvement requires decades of selection and will not solve the current welfare crisis affecting billions of birds today. Short-term management improvements including perch redesign, lighting management, and improved calcium nutrition can reduce fracture rates while genetic improvement proceeds. The welfare urgency requires immediate action on all available levers simultaneously rather than waiting for a single perfect solution.

What You Can Do

Support egg producers who purchase laying hen genetics from lines selected for keel bone integrity
Advocate for keel fracture prevalence to be a mandatory reported welfare metric for all commercial egg producers
Engage with egg welfare certification bodies to include keel bone improvement targets in certification criteria
Support research into the most effective combinations of genetic, nutritional, and housing interventions
Choose eggs from producers with documented keel welfare monitoring and improvement programmes
Reduce egg consumption or shift to producers committed to transparent keel fracture reduction