Sow Longevity and Reproductive Welfare

Extending productive sow longevity reduces the welfare costs of high turnover in commercial pig production while improving farm economics and sustainability metrics.

Key Facts

Commercial sows are typically culled after 5-6 parities, often at 3-4 years of age, despite lifespans of 15+ years
Lameness is the leading cause of premature culling, accounting for 30-35% of all sow removals
Gestation crate housing significantly increases lameness risk through muscle atrophy and hoof problems
Sows in group housing with adequate space show better leg health and survive significantly longer in production
Each additional parity from a proven sow reduces the proportion of young gilt mortalities in the herd
Longer-lived sows have lower lifetime environmental footprints per pig produced
Reproductive longevity correlates with earlier born weight, good body condition, and low lameness history

Welfare Considerations

Sow longevity is a welfare issue because high turnover rates mean the average commercial sow experiences a short life characterized by repeated reproductive cycles under physically demanding conditions. The high culling rate reflects welfare problems — lameness, reproductive failure — rather than natural aging. Systems that support sow longevity, particularly group housing with better leg health outcomes, simultaneously improve welfare, reduce replacement gilt costs, and improve sustainability metrics. The case for welfare investment in sow longevity is thus also an economic case, making it one of the more tractable welfare improvement opportunities in intensive pig production.

What You Can Do

Support farms with lower sow replacement rates and group housing systems
Choose pork from certified higher-welfare systems with welfare longevity reporting
Advocate for gestation crate bans that would improve sow leg health and longevity
Support research into genetic selection for leg health and longevity in commercial sow lines