Respiratory disease is the most common health problem in pig farming globally, causing significant suffering and economic loss. Understanding its welfare impact and prevention informs better management.
Respiratory disease welfare impact is substantial but often underappreciated because affected pigs show subtle signs. Pigs with subclinical respiratory disease eat less, grow slower, and experience persistent discomfort from inflamed airways. Chronic respiratory disease reduces quality of life throughout the production period. Prevention through environmental management - particularly ventilation - is the most effective welfare intervention. Ammonia from accumulated waste irritates respiratory tracts and suppresses immune function; effective ventilation systems dramatically reduce disease incidence.