What Are Gestation Crates?
Gestation crates (also called sow stalls) are metal enclosures approximately 0.6m wide and 2.2m long — barely larger than the sow's body — used to house pregnant pigs individually during most or all of their 16-week gestation period. The sow cannot turn around, take more than a step forward or backward, or engage in most natural behaviors. She can only stand, lie down, and eat from the front-mounted feeder.
~0.6m
Width of a gestation crate
16 weeks
Duration of pig pregnancy
2013
Year EU required group housing phase-in
~900M
Pigs slaughtered globally per year
Gestation crates were developed to prevent aggression between sows in group housing and to ensure individual feeding — practical problems that group housing management must address. But the welfare costs of the solution — near-total immobility for an intelligent, active animal for months at a time — are severe and well-documented.
The Welfare Science
Pigs are among the most cognitively complex of farmed animals — comparable to dogs in many behavioral measures, with strong social, exploratory, and rooting motivations. Gestation crates prevent virtually all expression of these behaviors.
Documented Welfare Harms:
- Stereotypic behaviors: Crated sows develop repetitive behaviors including bar-biting, rooting against the floor, and head-weaving — indicators of chronic frustration and poor welfare. Prevalence of stereotypies is significantly higher in crated than group-housed sows
- Musculoskeletal problems: Immobility causes muscle weakness, joint problems, and bone density loss. Sows emerging from crates after extended confinement often have difficulty walking
- Cardiovascular effects: Reduced movement impairs cardiovascular fitness
- Psychological frustration: Inability to root, explore, or interact socially causes chronic behavioral frustration with measurable physiological correlates (cortisol, behavioral indicators)
- Urinary tract infections: Higher rates in crated sows, associated with inability to move and inadequate hydration incentives
Research Finding: Studies comparing crated and group-housed sows consistently find lower stereotypy rates, better physical condition, and behavioral indicators of better welfare in well-managed group housing systems. The science in favor of eliminating gestation crates is among the clearest in farm animal welfare.
Global Legislative Progress
| Jurisdiction | Status | Details |
|---|
| European Union | Sow stalls largely banned | Prohibited from 4 weeks after service until 1 week before farrowing since 2013 |
| Sweden | Banned since 1988 | Pioneered the ban decades before EU action |
| UK | Banned since 1999 | Earlier than EU mandate |
| New Zealand | Banned | Phase-out completed |
| Canada | Industry phase-out committed | Code of Practice targets complete elimination |
| USA — California | Banned by Proposition 12 | Applies to pork sold in California regardless of origin |
| USA — 10+ states | State-level bans | Arizona, Florida, Oregon, Colorado, Michigan, and others |
| USA — federal | No federal ban | Majority of US production still uses gestation crates |
| China | No ban; industry dominates | Largest pork producer globally; minimal welfare regulation |
| Brazil | Significant corporate commitments; no national ban | Major pork exporter; transition underway in corporate chains |
Corporate Commitments
Beyond legislation, corporate commitments have been a major driver of gestation crate phase-out, particularly in the USA where federal law has not acted.
Major Commitments: McDonald's, Wendy's, Burger King, Subway, Costco, Walmart, Kroger, Smithfield Foods, and dozens of other major US food companies have committed to eliminate gestation crates from their supply chains. Many have already achieved or are close to achieving their targets.
The Humane Society of the United States (HSUS) and other organizations have conducted sustained corporate campaign work that has driven these commitments. The combination of legislative bans in key states (particularly California's Prop 12, which creates a de facto national standard for companies supplying the California market) and corporate commitments is reshaping US pork production.
Group Housing: Managing the Transition
The primary challenge with eliminating gestation crates is managing sow aggression and ensuring adequate individual feeding in group systems. These are real practical problems, but they are solvable with good management and appropriate system design.
Group Housing Systems
- Electronic sow feeding (ESF): Individual feeding stations controlled by RFID ear tags allow group housing while ensuring each sow receives her individual ration. ESF is considered the gold standard for large group housing systems
- Floor feeding with space allowance: Adequate floor space and simultaneous feeding points reduce competition
- Stable group management: Keeping sow groups stable (avoiding frequent mixing of unfamiliar animals) dramatically reduces aggression
- Enrichment: Providing rooting materials and enrichment reduces aggression by providing behavioral outlets
Success Evidence: EU producers have demonstrated that group housing is entirely viable at commercial scale. Countries that banned crates early (Sweden, UK) have productive, profitable pork industries operating without gestation crates. The "management is too difficult" argument has been empirically disproven.
Beyond Gestation Crates: Farrowing Crates
Farrowing crates — in which sows are confined around the time of birth and during nursing — are the next major welfare frontier. They are currently still permitted even where gestation crates are banned, but welfare science and advocacy are building the case for reform.
- Farrowing crates prevent sow movement to protect piglets from crushing — a legitimate welfare concern
- Alternative systems (deep-litter farrowing pens, loose-housed farrowing) can achieve comparable piglet survival rates with better sow welfare, but require higher management skill
- Several EU member states and companies are developing and piloting farrowing pen alternatives