Group Housing for Farmed Pigs: Social Needs and Welfare Benefits

Pigs are highly social animals that suffer in isolation. Transitioning from individual to group housing for sows and growing pigs is one of the most significant welfare improvements available to the pork industry.

Key Facts

The EU banned individual sow stalls (gestation crates) for most of pregnancy in 2013, requiring group housing from 4 weeks after mating.
The US has seen voluntary retailer-driven commitments to gestation crate elimination, with most major chains having set deadlines.
Group-housed sows show lower cortisol levels, higher natural behaviour expression, and better cardiovascular health than individually housed sows.
Aggression at mixing is a welfare concern in group housing; pen design, space allocation, and feeding systems affect conflict levels.
Electronic sow feeding (ESF) systems allow individual feeding in group settings, reducing competition and associated injuries.
Growing pigs (finishers) are typically group-housed already, but stocking density, enrichment, and pen design remain welfare variables.

Welfare Considerations

The shift from individual to group sow housing represents one of the largest-scale welfare improvements in modern agriculture. Gestation crates prevent sows from turning around for months at a time — a severe restriction of natural movement causing frustration, learned helplessness, and physical deterioration. Group housing is not without challenges: aggression at mixing can cause injuries, and feeding competition must be managed carefully. However, well-designed group housing with adequate space, ESF, and enrichment substantially improves sow welfare outcomes across multiple dimensions. Consumer and retailer pressure has been effective in driving this change where legislation has been slow.

What You Can Do

Choose pork products from suppliers that have eliminated gestation crates from their supply chains.
Ask your supermarket and favourite restaurants about their gestation crate policies and timelines.
Support the Humane Society's campaigns for gestation crate elimination in US pork production.
Reduce pork consumption — the most direct way to reduce individual welfare impact while industry transitions.
Learn about pig social behaviour and intelligence to better understand why isolation causes such significant suffering.