Pig Farrowing Systems: Welfare Trade-offs in Modern Production

Farrowing systems for sows involve complex welfare trade-offs between sow behaviour and piglet survival. Understanding these trade-offs informs better system design.

Key Facts

Conventional farrowing crates confine sows for 3-5 weeks, preventing almost all movement
Crate-free farrowing systems have higher piglet crushing mortality, typically 15-20% versus 10-12% in crates
Research shows sow motivation to build nests is extremely strong — frustrated nest-building causes significant stress
Temporary crating systems allow sow movement before and after the critical crushing-risk period
Modified loose farrowing systems with protective features can achieve comparable survival rates to crates
Several European countries including Sweden and Norway have operated largely crate-free for decades
Farmer training and management skills are crucial determinants of outcomes in loose farrowing

Welfare Considerations

The farrowing crate debate encapsulates one of animal welfare's most difficult dilemmas: preventing one form of suffering (piglet crushing) while imposing another (severe sow behavioural deprivation). Research has shown that sows have a powerful pre-farrowing behavioural drive to find a secluded site and build a nest — a drive that is completely frustrated in farrowing crates, causing clear distress indicators. The same research shows that experienced farmers operating well-designed loose or semi-loose farrowing systems can achieve comparable piglet survival to crated systems. The key variables are system design and management quality. Policy transition towards crate-free systems should be accompanied by farmer training support and appropriate timelines for infrastructure investment.

What You Can Do

Support pork labelling schemes that disclose farrowing system type
Choose pork products from farms demonstrating crate-free or low-restriction farrowing
Advocate for legislative timelines requiring transition to higher welfare farrowing systems
Support research into optimised loose farrowing system designs
Encourage farmers through purchasing decisions and direct engagement to consider welfare improvements