The use of red light in chicken coops has been studied for its potential effects on growth, behavior, and welfare in broiler chickens. Key findings from relevant research include:
Improved Growth Performance:
Exposure to monochromatic red light (632 nm) during incubation was associated with higher body weight in broiler chickens during the rapid growth phase (days 18–21) compared to blue light. This growth advantage was linked to increased passive behaviors (e.g., resting, preening) and reduced active behaviors (e.g., walking, fighting), suggesting red light may enhance energy allocation to growth rather than activity.
Behavioral Benefits:
Chickens incubated under red light exhibited less aggressive or active behaviors, such as foraging and wing-flapping, which could reduce stress and improve welfare. However, feeding and drinking behaviors remained unaffected.
Energy Efficiency:
While not directly tested with red light, intermittent lighting programs (e.g., alternating light and dark periods) have shown promise in maintaining performance while reducing energy consumption. Combining red light with such programs could further optimize energy use in coops.
Preference Considerations:
Broiler chickens generally prefer higher light intensities (e.g., 20 lux) for feeding areas, but lower intensities may be suitable for resting zones. Red light’s dimmer perception by poultry might align with these preferences while still supporting productivity.
Potential Welfare Implications:
The calming effects of red light observed in embryonic and postembryonic stages suggest it may reduce stress-related behaviors in coop environments. However, further research is needed to validate its long-term impacts under commercial conditions.
Red light may enhance growth and welfare in broiler chickens by modulating behavior and energy use, though its integration with lighting schedules and coop design requires tailored implementation.