Space allowances during pig transport directly affect welfare through injury, thermal comfort, and stress. Understanding regulatory standards and their welfare basis informs better practice.
Transport space allowances determine whether pigs can perform basic behaviors during journeys. Insufficient space prevents all pigs from lying down simultaneously, causing fatigue in animals unable to rest. Overcrowding increases aggression between unfamiliar pigs sharing close proximity under stress. Thermal stress from inadequate space for heat dissipation adds to welfare harm particularly in warm weather. The current regulatory standards represent negotiated compromises between welfare and commercial efficiency rather than scientifically optimal welfare minima. Research consistently shows welfare benefits from space allowances above regulatory requirements.