Outdoor pig production faces seasonal welfare challenges in summer including heat stress, UV damage, and parasite burdens that require specific management interventions.
Outdoor pig welfare in summer involves managing the profound mismatch between pig physiology and warm weather conditions. Pigs' inability to sweat means heat cannot be dissipated through skin surface evaporation - they must use behavioral thermoregulation through wallowing, which is why access to mud or water is not a comfort preference but a genuine physiological necessity. A pig without wallow access in hot weather experiences escalating thermal stress that becomes life-threatening at temperatures that would be merely uncomfortable for humans. The welfare standard for outdoor pigs in warm weather must include wallow access as a minimum - this is non-negotiable for basic welfare in species unable to thermoregulate without behavioral assistance.