🐷 Pig Gestation Welfare Deep Dive 2025

Comprehensive welfare analysis of pregnant sow management globally

The Gestation Period

Pigs have a 114-day gestation period. For this entire period, sows in conventional US and most non-EU production are kept in individual gestation stalls — metal enclosures 60cm wide that prevent turning around. The EU banned continuous gestation stall confinement in 2013; the US has no federal prohibition; several states have banned or are phasing out stalls. The welfare evidence against permanent individual confinement of highly intelligent social animals is overwhelming.

⚠️ USA: approximately 60-70% of sows still in individual gestation stalls

⚠️ Stereotypic behaviors (bar biting, rooting at floor): affect 30-80% of stall-housed sows — indicator of chronic frustration

Behavioral Needs During Gestation

Pregnant sows have strong behavioral motivations that stalls prevent:

Nesting: Wild sows build elaborate nests before farrowing; stall-housed sows show persistent nesting attempts impossible in confined space
Social interaction: Sows form stable social groups with preferred companions; isolation causes psychological deprivation
Foraging and rooting: Natural foraging occupies 6-8 hours daily; completely prevented in stalls
Freedom of movement: Unable to turn around for 16 weeks; causes muscle atrophy and cardiovascular deconditioning

✓ Group-housed sows: stereotypic behavior rate 3-5× lower than stall-housed sows in multiple studies

Global Reform Status

EU: stalls prohibited except 4 weeks post-mating (since 2013); compliance mixed in some member states. UK: stalls fully prohibited. Australia: voluntary industry code targets phase-out. Canada: National Farm Animal Care Council code requires group housing transition. USA: California Proposition 12 (2018) banning stall pork sales has driven supply chain pressure. Mexico: no federal prohibition. China: growing industry interest in group housing as part of modernization.

✓ Consumer pressure on major US retailers (Walmart, Costco, McDonald's) has driven corporate gestation-stall-free commitments covering majority of US supply chain