Poor air quality in pig buildings causes respiratory disease and welfare compromise, with ammonia, hydrogen sulfide, dust, and inadequate ventilation being key targets for welfare improvement.
Key Facts
Ammonia from pig waste causes respiratory irritation at concentrations above 10-15 ppm that are common in poorly ventilated units
Hydrogen sulfide from slurry during agitation can reach lethal concentrations rapidly in poorly ventilated spaces
Dust from feed, bedding, and skin causes respiratory inflammation that predisposes to pneumonia
Natural ventilation through appropriate building design reduces energy costs and improves air quality
Air quality welfare indicators include the five freedoms respiratory component and validated air quality measurement tools
High-health herd status achieved through biosecurity and air quality management reduces respiratory disease prevalence
Welfare Considerations
Air quality in intensive pig housing is a fundamental welfare issue that directly causes respiratory disease and chronic discomfort. Pigs in high-ammonia environments experience persistent mucous membrane irritation equivalent to humans living in a heavily polluted environment. Respiratory disease is one of the most common causes of mortality and production losses in indoor pig production. Welfare-conscious producers who invest in ventilation design and air quality monitoring reduce disease rates and improve the daily welfare experience of every pig in the building. Simple measurements like ammonia concentration are accessible indicators of indoor air welfare status.
What You Can Do
Monitor ammonia concentrations in pig housing and take corrective action if levels exceed 10-15 ppm
Ensure ventilation systems are designed and maintained to deliver adequate air exchange rates for stocking density
Reduce stocking density or improve ventilation if respiratory disease prevalence indicates air quality problems
Never agitate slurry without ensuring staff and pigs are removed from the building first
Support research into low-emission housing designs that improve air quality for pigs and reduce environmental impact