Laying Hen Dust Bathing: Motivation and Provision

Dust bathing is one of the strongest motivated behaviours in laying hens and a key welfare indicator; hens deprived of dust bathing substrate show acute frustration followed by sham bathing on cage floors.

Key Facts

Hens deprived of dust bathing show a 2-fold increase in the behaviour when substrate is provided (rebound)
Dust bathing reduces ectoparasite burden and appears to maintain feather condition
Sham dust bathing on cage wire is performed but does not satisfy the motivation
Hens prefer loose particulate substrate for dust bathing above almost all other resources tested

Welfare Considerations

The strength of the dust bathing motivation is demonstrated by rebound behaviour experiments: hens given access to substrate after deprivation dust bathe significantly more than non-deprived birds, indicating accumulated motivational deficit. This strong motivation means that cage systems preventing dust bathing cause genuine welfare harm even when other needs are partially met. Providing appropriate dust bathing substrate is now considered a minimum welfare standard by most certification bodies.

What You Can Do

Choose eggs from hens with access to adequate dust bathing substrate
Support welfare standards that require measurable dust bathing substrate provision
Raise awareness that dust bathing is a welfare need, not merely a preference