Dust bathing is a fundamental behavioural need for laying hens. Deprivation of suitable substrate causes significant frustration and stereotypic behaviour, making provision a key welfare indicator.
Dust bathing is not simply a preference but a physiologically and behaviourally important activity that hens are strongly motivated to perform regardless of whether suitable substrate is available. When substrate is absent, hens perform vacuum dust bathing on any available surface, demonstrating the strength of the motivation. Systems that provide adequate loose substrate allow full expression of this behaviour and reduce the frustration associated with incomplete performance. Free-range and barn systems with maintained litter quality provide better dust bathing opportunities than cage systems of any type, making this a useful welfare differentiator between housing systems.