Pig Ventilation and Respiratory Disease Prevention

Poor ventilation in pig housing is a major cause of respiratory disease. Adequate ventilation design and management prevents suffering and improves pig welfare significantly.

Key Facts

Porcine respiratory disease complex (PRDC) costs the industry significantly and causes substantial welfare harm
Pathogens including PRRS virus, Mycoplasma hyopneumoniae and Pasteurella multocida are common PRDC contributors
Ammonia from accumulated slurry irritates airways increasing susceptibility to respiratory infection
Minimum ventilation rates of 0.5 air changes per hour in cold weather maintain air quality
Continuous flow systems separating air inlet and outlet prevent recirculation of contaminated air

Welfare Considerations

Pigs with respiratory disease suffer from breathlessness, coughing, fever and reduced feed intake. Chronic low-grade respiratory disease common in poorly ventilated systems causes persistent discomfort and impaired welfare without obvious acute disease signs. Ammonia levels above 20 ppm cause direct respiratory irritation. Investment in ventilation infrastructure is directly welfare-positive.

What You Can Do

Monitor ammonia levels in pig housing and take corrective action when levels exceed guidelines
Ensure ventilation systems are maintained and adjusted seasonally for temperature and pig numbers
Support farming systems with lower stocking densities allowing adequate air quality maintenance
Buy pork from certified higher-welfare systems with outdoor access and better air quality standards
Advocate for welfare standards that include air quality monitoring as a welfare indicator