Laying Hen Keel Bone Fracture Prevention

Preventing keel bone fractures in laying hens requires coordinated intervention across genetics, nutrition, housing design, and management practices.

Key Facts

Keel bone fractures affect 50-80% of hens in commercial systems including enriched cages and aviaries
Genetic selection for bone strength is feasible — heritability estimates suggest breeding programmes can reduce prevalence meaningfully
Calcium and phosphorus nutrition during pullet rearing affects bone mineralisation and adult fracture risk
Landing pad softness at the base of perches significantly affects impact force and fracture risk
Early fractures (before 30 weeks) are associated with more severe welfare impact than later-onset fractures
Automated palpation or X-ray assessment enables population-level keel bone monitoring during production cycles

Welfare Considerations

Keel bone fracture prevention in laying hens requires a systems approach because no single intervention eliminates the problem. Genetics, nutrition, housing design, and management all contribute independently and interactively. A hen with strong bone mineralisation from good pullet nutrition can still fracture if landing pads at perch bases are hard and drops are high. A hen in well-designed housing with soft landing pads may fracture if she has poor bone density from inadequate calcium rearing. The most effective prevention combines selective breeding for bone strength, optimal calcium and phosphorus provision from rearing through peak production, perch and platform design minimising impact force, and regular monitoring to track population-level prevalence as a welfare outcome indicator. The welfare improvement available through coordinated intervention is substantial — from 80% fracture prevalence toward potentially under 20% in optimised systems.

What You Can Do

Support egg producers who publish keel bone monitoring data and participate in welfare research programmes
Advocate for keel bone fracture prevalence as a mandatory welfare indicator in all laying hen certification schemes
Support genetic selection research programmes aimed at improving bone strength in commercial laying hen lines
Encourage aviary manufacturers to design perch and platform systems that minimise landing impact force
Choose eggs from producers demonstrating active keel bone prevention programmes, not just housing system type