Pig Stocking Density and Welfare Outcomes

The space allowance given to pigs in indoor systems has measurable effects on their behaviour, health, and stress levels, making stocking density a critical welfare variable.

Key Facts

EU regulations require minimum space of 0.65 m2 per finishing pig but research suggests 1.0 m2 or more is needed for positive welfare
Overcrowded pigs show increased aggression, tail biting, and competition for resources such as feeders and drinkers
High stocking density reduces pigs' ability to perform natural behaviours like rooting, exploring, and resting comfortably
Heat stress is exacerbated in dense housing as body heat builds up and cooling is less effective
Mortality and morbidity rates rise with increasing density due to disease transmission and injury
Freedom Foods and RSPCA Assured standards in the UK require higher space allowances than legal minimums

Welfare Considerations

Stocking density directly controls whether pigs can express natural behaviours, avoid social conflict, and maintain thermal comfort. The minimum legal standard in many countries falls well below what research shows pigs need. Advocates consistently push for improved standards, and consumer and retailer pressure on producers to improve space allowances has driven real change in some markets.

What You Can Do

Buy pork carrying higher-welfare certifications that specify space allowances
Support campaigns pushing for higher minimum stocking density standards in law
Ask retailers and restaurants about their pork welfare policies
Learn more at the RSPCA and Compassion in World Farming websites