Lighting for Broiler Chickens: Welfare Science and Commercial Practice

Light management in broiler houses profoundly affects bird welfare through its effects on activity, sleep, stress levels and disease, making lighting one of the most evidence-based and cost-effective welfare improvements available to the broiler industry.

Key Facts

Conventional broiler lighting programmes use near-continuous light (23 hours) to maximise feeding time and growth rate
Continuous light causes chronic sleep deprivation in broilers, impairing immune function and increasing stress
EU regulations since 2007 require minimum 6 hours darkness per day in broiler houses
Dim light is preferred by broilers and reduces fearfulness and aggressive behaviour at low light levels
Intermittent lighting programmes providing regular dark periods significantly improve leg health and reduce mortality
Broilers in houses with windows or access to natural light show improved welfare across multiple indicators
Blue-enriched lighting reduces fearfulness in broilers compared to conventional yellow-white lighting
Lighting programmes interact with stocking density — at high densities even improved lighting provides limited welfare benefit

Welfare Considerations

Chronic sleep deprivation from near-continuous lighting causes significant welfare harm in broiler chickens, impairing immune function, increasing stress responses and contributing to the leg health problems prevalent in commercial flocks. The research demonstrating benefits of regular dark periods has been available for decades, yet implementation has been slow due to industry inertia and misconceptions about productivity impacts. Studies show that providing 6-8 hours of darkness has minimal or no negative impact on growth rate while substantially improving welfare indicators. The widespread availability of evidence-based lighting protocols makes lighting improvement one of the most achievable welfare gains in broiler production.

What You Can Do

Support regulatory requirements that mandate minimum dark periods in broiler houses above EU minimums where possible
Choose chicken products from certified higher-welfare producers that specify improved lighting programmes
Advocate for research and uptake of natural or blue-enriched lighting in broiler facilities
Encourage food companies to include lighting requirements in their broiler welfare supply chain standards
Support the Better Chicken Commitment which includes environmental standards covering lighting
Raise awareness that broiler lighting is a significant and improvable welfare factor that receives little public attention