Pig Respiratory Disease and Ventilation

Respiratory disease is the leading cause of illness in intensive pig production, driven by poor ventilation, high stocking densities, and pathogen pressure that cause significant welfare problems.

Key Facts

Enzootic pneumonia caused by Mycoplasma hyopneumoniae affects the majority of pigs in intensive systems
Porcine Reproductive and Respiratory Syndrome (PRRS) virus causes major welfare and production losses
Ventilation failure events in summer can cause rapid mortality from heat stress and respiratory failure
The pork industry uses antimicrobials extensively to manage respiratory disease pressure
Alternative to antibiotics including vaccines and improved housing are increasingly important

Welfare Considerations

Pigs with respiratory disease experience difficulty breathing, reduced appetite, fever, and secondary complications. Chronic low-grade pneumonia may affect entire groups, reducing welfare and growth simultaneously. Poor ventilation causes ammonia accumulation and heat stress that compound respiratory disease pressure. The high prevalence of respiratory disease in conventional pig production represents a systemic welfare problem requiring housing and management solutions rather than just treatment.

What You Can Do

Support pig welfare standards requiring adequate ventilation and stocking density limits
Choose pork from producers certified under higher welfare standards with outdoor or enriched housing
Advocate for antimicrobial stewardship in pig farming to prevent resistance
Support research into pathogen management strategies that reduce disease without antibiotic dependency
Raise awareness about the relationship between intensive production conditions and respiratory disease