Chicken Lighting Welfare in Poultry Systems

How lighting management in poultry production affects broiler and laying hen welfare, behavior, and health outcomes.

Key Facts

Lighting programs in commercial poultry production manipulate day length to control growth rates, feed intake, and reproductive cycles
Continuous or near-continuous light (23 hours on, 1 hour off) has historically been used in broiler production to maximize feed intake and growth
Minimal dark periods cause leg problems, heart failure, and sleep deprivation in fast-growing broilers — the EU mandates a minimum 6-hour dark period
Laying hen behavior including preening, dust bathing, and wing stretching requires adequate light intensity for normal expression
Blue-light enriched LED systems maintain behavioral activity while reducing aggression in some laying hen systems
UV-A light allows birds to see natural color signals invisible under conventional fluorescent lighting, improving visual welfare

Welfare Considerations

Lighting is a fundamental environmental parameter that profoundly affects poultry welfare. Continuous or near-continuous light in broiler production deprives birds of rest, contributes to musculoskeletal problems, and prevents the establishment of normal behavioral rhythms. Minimum dark period requirements, now mandated in EU broiler production, represent a basic welfare improvement that was resisted by industry as reducing growth performance but has been implemented without the predicted production losses in most operations. For laying hens, light quality as well as quantity matters — appropriate light intensity allows natural behavioral expression while very low intensities prevent normal activity. Dimmable LED systems that can be programmed to provide appropriate photoperiods and spectra represent the technical direction for welfare-positive poultry lighting.

What You Can Do

Support broiler products certified to standards requiring minimum dark periods in lighting programs
Advocate for mandatory minimum dark period regulations for all commercial poultry production systems
Support research into optimal lighting spectra and programs that support poultry behavioral welfare alongside production objectives
Ask egg and poultry retailers about their supplier lighting requirements when requesting welfare information
Support EU-equivalent lighting welfare standards in countries where minimum dark period requirements do not yet exist