Farmed Broiler Chickens and Lighting Programs

The lighting environment of broiler chickens significantly affects their welfare — photoperiod manipulation that maximizes growth can impair rest, natural behavior, and long-term health.

Key Facts

Conventional broiler lighting uses near-continuous light (23 hours/day) to maximize feed intake
Continuous or near-continuous lighting suppresses normal diurnal rhythms and rest behavior
Dark periods of minimum 6 hours significantly improve leg health and welfare outcomes
EU Directive 2007/43/EC requires minimum 6 hours dark per day in broiler facilities
Higher welfare certifications typically require 8-hour dark periods

Welfare Considerations

Chickens are diurnal animals with strong physiological need for dark rest periods. Near-continuous lighting in conventional broiler production suppresses circadian rhythms, reduces sleep quality, and increases the leg problems already driven by fast growth rates. Birds denied adequate darkness show impaired immune function and behavioral signs of fatigue. The welfare improvement from simply providing adequate darkness is large and inexpensive — yet minimum dark periods are not universally enforced even where regulations exist.

What You Can Do

Choose chicken certified to standards requiring minimum 8-hour dark periods
Support enforcement of EU minimum dark period requirements in broiler facilities
Advocate for dark period requirements in broiler welfare standards globally
Donate to organizations monitoring broiler welfare compliance in major production countries
Reduce conventional chicken consumption and shift to certified higher welfare alternatives