The transition from gestation crates to group housing for pregnant sows represents a significant welfare improvement, though implementation challenges and welfare risks in group systems must be managed carefully.
Gestation crate confinement causes severe suffering through near-total physical immobility, social isolation, and frustration of basic behavioral needs. The welfare case for eliminating crates is robust and broadly accepted in welfare science. Group housing introduces its own management challenges — mixing aggression can cause injury, and feeding competition disadvantages low-ranking sows — but these challenges are manageable with appropriate design. Electronic sow feeding, generous space allowances, and stable social groups substantially reduce aggression risk. The direction of travel in progressive welfare is clear: group housing with active management is the welfare-positive standard.