Finishing Pig Welfare: Stocking, Environment, and Management

Welfare in Pig Finishing Systems

The finishing stage — typically from 30-35 kg to slaughter weight of 100-115 kg — represents the final and longest phase of commercial pig production. Welfare outcomes during finishing profoundly affect the animals' overall lifetime experience and have significant implications for product quality, farm economics, and consumer trust.

Housing Systems

Most finishing pigs in Europe are housed in groups of 10-20 pigs on fully or partially slatted concrete floors. This system prioritises waste management efficiency but compromises several welfare priorities. Alternative systems include deep straw bedding (welfare benefits for behaviour expression, but higher disease challenge), kennelled systems (improved thermal comfort), and outdoor finishing (highest welfare potential, weather dependent).

Space Allowance

EU Directive 2008/120/EC specifies minimum space allowances: pigs 85-110 kg require 0.65 m² each. Research consistently demonstrates that higher space allowances reduce aggression, improve lying behaviour, and increase welfare. Production systems operating at minimum legal space are associated with elevated tail biting, aggression, and lameness rates.

Tail Biting Prevention

Tail biting is the most significant welfare problem in finishing pigs, causing pain, secondary infection, and potentially fatal outbreaks. Risk factors include: barren environments, high stocking density, inadequate nutrition (especially salt and mineral imbalances), poor air quality, temperature extremes, and mixing unfamiliar animals.

Preventive measures include: enrichment provision (chains, ropes, wood, straw), adequate space, maintaining stable social groups, checking salt/mineral balance, optimising ventilation, and early identification of biters for removal. Routine tail docking remains common despite being ethically controversial and legally requiring risk assessment under EU law.

Enrichment Requirements

EU law requires pigs have permanent access to enrichment materials. Scientific evidence shows pigs strongly prefer manipulable, degradable substrates — straw, wood, and compost score highest in preference tests. Hanging chains and hard plastic toys provide less welfare benefit but are widely used in slatted systems due to ease of management. The gap between legal requirements and animal preference represents a significant welfare challenge.

Air Quality and Environment

Ammonia, dust, and CO₂ levels in finishing pig buildings affect respiratory health and comfort. Optimal ammonia levels are below 10 ppm; levels above 20 ppm cause respiratory irritation. Good ventilation design, appropriate stocking density, and regular slurry removal maintain air quality. Thermal comfort is important — pigs at finishing weight have optimal comfort temperatures of 15-20°C.

Social Management

Mixing unfamiliar pigs at any stage causes fighting to establish dominance hierarchy. Mixing at the start of finishing and maintaining stable groups throughout avoids repeated social disruption. If mixing is unavoidable, providing extra space, enrichment, and monitoring during the first 24-48 hours reduces injury risk.

Pre-Slaughter Welfare

The final hours of a pig's life — loading, transport, lairage, and slaughter — present major welfare challenges. Fasting before transport to reduce contamination risk should be limited to 12-18 hours maximum. Transport journeys exceeding 8 hours require stops for water and rest. At slaughter, effective stunning is the most critical welfare intervention, ensuring unconsciousness before killing.

This page is part of the Animal Welfare Hub — providing evidence-based information to improve the lives of animals. Return to home.