Stocking density is one of the most fundamental welfare determinants for farm animals, affecting their ability to express natural behaviours and access resources.
Stocking density is a welfare lever with predictable and well-documented effects across species. Increasing stocking density reduces space for movement and behaviour expression, increases competition for resources, reduces access to food, water and resting areas, and increases disease transmission risk. The economic pressure to stock at maximum legally permitted density is strong, making regulatory minimum standards particularly important as welfare floors. Welfare-optimal density varies by species, system and management but is almost always higher than legally required minimum allowances in intensive systems.