Wean-to-Finish Pig Welfare in Continuous Flow Systems

Wean-to-finish systems move piglets from weaning directly to finishing without transfer stress, offering welfare advantages for certain production systems.

Key Facts

Traditional systems involve multiple moves between weaner, grower, and finishing units
Each move involves mixing unfamiliar pigs causing aggression and stress
Wean-to-finish systems keep stable social groups from weaning to slaughter
Reduced handling and mixing episodes substantially reduce cumulative stress exposure
Space allowances must scale appropriately as pigs grow to maintain welfare benefits

Welfare Considerations

Wean-to-finish systems offer welfare advantages through maintaining stable social groups and eliminating the repeated mixing stress of multi-stage systems. Each mixing event in traditional systems causes fighting, injury, and elevated cortisol. Pigs in stable groups develop established social hierarchies with reduced ongoing aggression. The welfare benefit is maintained only if space allowances scale with pig growth — insufficient space as pigs grow eliminates the social stability advantage.

What You Can Do

Support pork producers adopting wean-to-finish systems with stable social groups
Ask assurance schemes whether they assess social stability maintenance through production stages
Encourage research into optimal wean-to-finish system designs for different pig breeds
Advocate for space allowance scaling requirements in wean-to-finish welfare standards