Space allowance is one of the most welfare-significant variables in pig housing. Insufficient space prevents natural behaviour, increases aggression, and is associated with higher rates of injury and disease.
The link between space allowance and pig welfare is one of the most robustly documented relationships in farm animal welfare science. Pigs in crowded pens are not simply uncomfortable — they experience chronic frustration, elevated stress, higher rates of painful injury from aggression, and reduced ability to engage in any of the behaviours that constitute a good life for a pig. The legal minimum space allowances in most jurisdictions represent a compromise between economics and welfare that falls well short of what the science indicates pigs need. Consumer and regulatory pressure for higher space standards is therefore directly translated into reduced suffering for the approximately one billion pigs living in commercial systems at any given time globally.