Outdoor pig production has welfare advantages over intensive systems but creates specific summer welfare challenges from heat stress, sunburn and parasite exposure that require active management.
Outdoor pig welfare in summer illustrates that more natural conditions do not automatically mean better welfare. Pigs without adequate shade, wallowing opportunities and fly control can suffer acutely from heat stress and fly strike. The welfare advantage of outdoor systems over indoor systems depends entirely on appropriate management providing the thermal comfort, parasite control and social environment that pigs need. Wallowing is not a luxury but a biological necessity for pigs - it is how they thermoregulate, and denial of wallowing in hot weather constitutes a welfare failure. Good outdoor pig welfare requires shade structures, maintained wallow areas, fly control protocols and stocking densities that allow grass cover to prevent poaching.