Farrowing System Welfare: Crates, Pens and Free Farrowing

Farrowing Systems and Sow Welfare

The welfare of sows during farrowing is one of the most debated topics in farm animal welfare. Conventional farrowing crates — narrow metal stalls that confine sows for 4–6 weeks around farrowing — prevent the sow from turning around, performing nest-building, or expressing normal maternal behaviour. The welfare cost to the sow is substantial and well-documented. The industry justification — that crates protect piglets from being overlaid — is genuine but increasingly contested as free farrowing system designs improve. The pathway from crates to welfare-positive farrowing systems is one of the most important challenges in pig welfare.

The Welfare Case Against Farrowing Crates

Extensive research documents the welfare deficits associated with conventional farrowing crates:

Physical Welfare

Inability to turn around causes frustration and muscle atrophy
Restricted posture increases risk of pressure sores and lameness
Injury risk from crate bars — shoulder sores are common (prevalence up to 60% in some surveys)
Inability to thermoregulate effectively — sows in crates cannot move away from heat or cold areas

Behavioural Welfare

Nest-building is one of the most strongly motivated pre-farrowing behaviours in sows — deprivation causes clear frustration and heightened cortisol
Normal maternal behaviour (inspection of piglets, repositioning, nursing posture adjustment) is severely restricted
Stereotypic bar-biting and repetitive rooting are significantly higher in crated sows vs. free-farrowing
Sows in crates show reduced exploratory behaviour and higher indicators of anxiety

Free Farrowing Systems

Free farrowing systems allow sows to move freely and express natural behaviour:

Established Systems

Pen and rail systems: Open pen with protective rail around perimeter (prevents sow from crushing piglets against wall); sow free to move within pen
Comfort deck systems: Heated area for piglets adjacent to sow lying area; sow can choose lying position
Outdoor farrowing: Farrowing arcs/huts with outdoor access — provides maximum behavioural freedom but highest piglet mortality risk in poorly managed systems

Research Evidence

Free farrowing sows show significantly more nest-building behaviour, better maternal responsiveness, and lower stress indicators
Piglet pre-weaning mortality in well-managed free farrowing systems can be comparable to crate systems (8–10%)
Critical factors: adequate space (minimum 5–6m² farrowing area), appropriate flooring (non-slip), proper creep heating, stockperson supervision during farrowing

Temporary Confinement Systems

A middle path — sows can be confined briefly around farrowing (24–48 hours) and then released within the pen:

Reduces crushing risk during the highest-vulnerability period
Allows nest-building behaviour pre-farrowing
Provides maternal freedom for most of the lactation period
EU and UK are moving toward mandating freedom farrowing — several countries (Switzerland, Sweden) have already moved away from conventional crates

Regulatory Trajectory

The direction of travel is clear:

UK government has committed to reviewing farrowing crate legislation
Several major UK retailers have committed to farrowing crate-free sourcing within defined timescales
EU Farm to Fork Strategy includes commitment to phase out farrowing crates
RSPCA Assured standards already prohibit the use of conventional farrowing crates for the full lactation period

Stockperson Role

In free farrowing systems, skilled stockpersonship is essential. Staff must:

Be present during farrowing (or use monitoring systems)
Intervene appropriately to reposition piglets away from danger
Manage temperature in piglet creep areas precisely
Assess sow behaviour and intervene if maternal behaviour is abnormal