Laying Hen Aviary Systems - Welfare Outcomes

Aviary housing systems for laying hens provide significant improvements over conventional cages but also introduce new welfare challenges related to injurious pecking, air quality, and dust.

Key Facts

Aviary systems allow hens to move freely, fly, perch, and use a litter area for dustbathing
Studies show aviaries improve bone strength, muscle mass, and the ability to perform natural behaviours compared to cages
However, feather pecking and cannibalism can be higher in aviary systems without careful management
Ammonia levels from deep litter in aviary systems can be high if not actively managed, causing respiratory irritation
Injurious feather pecking in aviaries is a significant welfare challenge, particularly in large multi-tier systems
Beak trimming to reduce feather pecking is common but is itself a welfare compromise - better management can reduce reliance on it

Welfare Considerations

Aviary systems represent a genuine step forward in laying hen welfare compared to conventional battery cages - they enable flight, perching, dustbathing, and movement that cages eliminate. However, they are not inherently high-welfare environments: poorly managed aviaries can generate significant problems with injurious pecking, poor air quality, and social stress in large flocks. The welfare gains from cage-free housing are only fully realised with skilled management, appropriate flock size, adequate environmental enrichment, and careful monitoring. The transitional period as farms convert from cages to aviaries requires significant investment in stockperson training and management system redesign.

What You Can Do

Choose free-range or barn eggs from farms with published welfare monitoring outcomes
Support farms that have invested in training and management alongside physical system improvements
Advocate for beak trimming restrictions to encourage management improvements that reduce pecking
Learn about aviary welfare outcomes from the RSPCA and Compassion in World Farming research