PMWS in Pigs: Welfare Impacts of Post-Weaning Wasting Syndrome

Post-weaning multisystemic wasting syndrome causes severe welfare impacts in affected piglets including wasting, respiratory distress, and high mortality rates.

Key Facts

PMWS is associated with Porcine Circovirus Type 2 (PCV2) infection
Affected piglets show progressive weight loss, respiratory distress, and diarrhoea
Mortality in affected herds can reach 5-20% of the weaner population
Vaccination against PCV2 dramatically reduced PMWS prevalence after commercial vaccines became available
Good management, biosecurity, and low weaning stress reduce disease expression

Welfare Considerations

Pigs suffering from PMWS experience serious welfare impacts through progressive wasting, severe weight loss, difficulty breathing, and immune system collapse. The disease causes a prolonged deterioration before death, with affected pigs experiencing days to weeks of significant suffering. Early identification of PMWS pigs and prompt euthanasia for severely affected individuals is an important welfare intervention. Prevention through vaccination has been transformative for welfare outcomes.

What You Can Do

Ensure pig herds are vaccinated against PCV2 according to veterinary advice
Monitor weaner pigs closely for early signs of PMWS
Implement prompt euthanasia protocols for severely affected pigs
Maintain good biosecurity and hygiene to reduce disease pressure
Work with your vet to develop a PMWS prevention and response plan