Pig Litter Size Genetics Welfare

Selection for large litter sizes in pigs has increased total piglet numbers but at a cost to individual piglet survival and maternal welfare.

Key Facts

Average litter size in commercial sows has increased from 11 to over 16 piglets in 30 years
Increased litter size is associated with lower birth weight, higher neonatal mortality, and insufficient teats
Sow welfare is also affected: hyperprolific sows have more nutritional stress and shorter productive lives
Genetic selection for health and survival rather than pure litter size is advocated by welfare scientists
Some breeding companies are developing more balanced selection indices that include welfare traits

Welfare Considerations

The drive for maximum litter size has created systemic welfare problems for both piglets and sows; breeding decisions must integrate welfare outcomes alongside productivity metrics.

What You Can Do

Advocate for welfare-balanced breeding indices in pig genetics industry standards
Support pig welfare certification that addresses breeding system welfare implications
Raise awareness of hyperprolificacy as a welfare concern within pig welfare advocacy