Placing a single low-wattage LED light at the end of each feeding line is enough to shift flock uniformity by measurable margins. Research published in Veterinary Sciences demonstrates that this minor environmental modification produces consistent gains across uniformity, feed conversion, and mortality without changes to nutrition, genetics, or housing density.
Study design and treatment conditions
The study by Galosi et al. evaluated the effect of a 1.2-watt LED light positioned at the end of each feeding line in commercial broiler houses. Treatment houses received the LED fixtures; control houses operated under standard conditions. Male and female flocks were assessed separately, allowing the researchers to capture sex-specific responses to the intervention. Key production metrics recorded included body weight uniformity, feed conversion ratio, and mortality rate.
How LED light changes feeding behaviour
Chickens are capable of associating auditory and environmental cues with feeding events. The sound of auger movement and feed delivery triggers anticipatory behaviour, prompting birds to approach the feeding system. The LED light positioned at feeder line ends appears to reinforce this association, encouraging more frequent and better-distributed visits along the full length of the feeding system. The result is a more even access pattern across the flock, reducing the competitive advantage held by dominant birds near feed entry points and allowing subordinate birds to reach adequate intake levels.
Uniformity outcomes and production metrics
The uniformity improvements recorded were substantial. Female uniformity increased from 65.7% to 75.2%, a gain of 9.5 percentage points. Male uniformity rose from 48.5% to 54.1%, an increase of 5.6 percentage points. Feed conversion ratio improved from 1.608 in control houses to 1.567 in LED-equipped houses. Mortality also fell, from 5.57% in controls to 4.56% in treatment houses. Taken together, these figures indicate that the LED intervention produced benefits across multiple dimensions of flock performance simultaneously.
What poor uniformity costs at the processing stage
Flock uniformity has direct consequences for processing efficiency and product quality. When body weight distribution is tight, slaughter lines can be optimised for a consistent carcass size, reducing off-specification product and improving yields from cutting and boning operations. Where uniformity is poor, both underweight and overweight birds create inefficiencies: underweight birds yield less, while overweight birds may require additional handling or grading. Standardised carcass weight also supports more predictable output for retail and foodservice customers. The uniformity gains recorded in this study are large enough to influence these downstream outcomes in a commercially meaningful way.
Sources
- Galosi, L. et al. LED Light Applied to the Feeder: Impact on Growth Performances of Chickens under Productive Conditions. Veterinary Sciences, 2023, 10, 306. https://www.mdpi.com/2306-7381/10/5/306