Outdoor pig farming allows expression of natural rooting, foraging, and social behaviours unavailable in indoor systems, but weather extremes, disease management, and land impact present welfare and environmental challenges.
Outdoor pig welfare represents a genuine improvement over conventional indoor systems on behavioural welfare dimensions while introducing new challenges that require active management. The welfare gains are substantial and well-documented: rooting, foraging, social exploration, and positive affect expression (play in younger pigs, social engagement in all ages) are dramatically higher in outdoor systems. Pigs are not evolutionarily adapted to spend their lives on concrete — their bodies and minds evolved for complex soil environments. However, outdoor welfare is not automatically good welfare: unmanaged mud causes the same problems as in indoor systems; sunburn causes genuine acute pain in pink-skinned breeds; parasites cause chronic subclinical welfare harm without regular monitoring and treatment. The welfare optimum for outdoor systems involves proactive management of thermal comfort, parasite burden, and ground condition — not merely an absence of the indoor system constraints.