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Related Experiment Video

Updated: Jun 18, 2026

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research

An Experimental Approach to Investigating Effects of Artificial Light at Night on Free-Ranging Animals: Implementation, Results, and Directions for Future Research

Published on: February 2, 2022

Light intensity and social communication between hens.

H H Kristensen¹, R P White, C M Wathes

¹Faculty of Life Sciences, University of Copenhagen, Animal Behaviour and Welfare, Population Biology Group, Department of Large Animal Sciences, Denmark.

British Poultry Science

|December 1, 2009

Summary

Low light intensity significantly impacts social communication and food competition in laying hens. A minimum of 5 lux is recommended to ensure hens can effectively interact and access resources.

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Area of Science:

Animal behavior
Avian welfare
Ethology

Background:

Social communication is crucial for laying hen welfare and productivity.
Understanding the impact of environmental factors like light intensity is essential for optimizing housing conditions.

Purpose of the Study:

To investigate how varying light intensities affect social communication and resource competition in laying hens.
To determine the minimum light intensity required for effective social signaling and foraging.

Main Methods:

Experimental design involving pairs of hens (familiar/unfamiliar, similar/unequal rank) competing for food.
Assessment of social communication and competition under different light intensities (1, 5, 20, 100 lux).
Determination of hen rank based on success in food competition.

Main Results:

Light intensity of 1 lux negatively affected certain aspects of food competition.
Social communication and competition were generally maintained at 5 lux and above.
Hen rank and familiarity did not significantly alter the effects of low light intensity.

Conclusions:

A minimum light intensity of 5 lux is scientifically supported for maintaining social interactions in laying hens.
This finding provides partial justification for regulations requiring hens to see each other.
Ensuring adequate light is vital for hen welfare and social dynamics.