Outdoor access for pigs provides welfare benefits beyond regulatory compliance, enabling natural rooting, foraging, social, and thermoregulatory behaviour that indoor systems cannot replicate.
Outdoor pig access enables welfare behaviours impossible in indoor systems. Rooting in soil satisfies the fundamental foraging drive that makes chain enrichment in indoor systems so inadequate. Mud wallowing provides thermoregulation for a species without sweat glands that cannot otherwise cool itself effectively. Natural light and fresh air improve respiratory health. Social dynamics in outdoor groups with adequate space allow stable hierarchies to form without the chronic crowding aggression of intensive indoor systems. However, outdoor systems are not automatically welfare-superior: poorly managed outdoor fields in winter can involve significant cold stress, mud-related mobility problems, and reduced shelter access. The welfare potential of outdoor systems requires good management to realise.