Space allowance is a fundamental welfare parameter for laying hens, directly affecting their ability to express natural behaviours.
Space allowance in laying hen systems directly determines the ability of hens to perform dust bathing, wing flapping, nesting, and social behaviour. Even enriched colony cages severely restrict these behaviours due to the limited space per bird. The transition to cage-free systems in many countries represents a significant welfare improvement, though management quality within cage-free systems varies considerably.