Broiler Respiratory Disease Welfare and Genetics

Respiratory disease is a leading cause of morbidity and welfare harm in commercial broilers, with genetic selection for rapid growth contributing to respiratory compromise.

Key Facts

Broilers grow 300% faster than 1950s breeds creating cardiopulmonary systems too small for muscle mass
Ascites from right-sided heart failure affects 4-5% of commercial broilers annually
Sudden death syndrome kills healthy-appearing broilers through acute cardiac failure
High stocking density increases ammonia levels causing chronic respiratory irritation
Slower-growing breeds show dramatically reduced ascites and cardiac disease rates

Welfare Considerations

Commercial broilers suffer chronically from the cardiovascular and respiratory compromise that rapid growth creates. Ascites causes visible abdominal distension, lethargy, and progressive respiratory failure over weeks. The welfare burden is systemic - not from pathogen exposure but from genetics that prioritize muscle deposition over cardiorespiratory capacity. Transitioning to slower-growing breeds is the most evidence-based welfare intervention, reducing ascites prevalence, improving mobility, and allowing natural behavior expression.

What You Can Do

Choose chicken products from slower-growing breed programs like Global Animal Partnership Step 4+
Support Better Chicken Commitment retailer pledges for higher welfare broiler standards
Advocate for breed welfare standards that limit growth rates causing cardiovascular disease
Reduce chicken consumption or shift to products certified under robust welfare standards