Slow-Growth Broiler Breeds: Better Welfare Through Genetics

Standard broiler chickens have been selectively bred for extreme rapid growth that causes chronic suffering. Slow-growth breeds offer a welfare improvement by reducing growth rate-related health problems.

Key Facts

Standard broilers reach slaughter weight in 35–42 days, roughly double their great-grandparents' growth rate
Up to 30% of fast-growing broilers experience gait problems severe enough to impair normal movement
Slow-growth breeds take 56–63 days to reach market weight at lower final weights
Welfare outcomes assessment shows slow-growth birds have lower rates of lameness, contact dermatitis, and cardiac disease
The Better Chicken Commitment (BCC) includes a maximum growth rate standard to shift producers toward slower breeds
Over 300 major food companies globally have signed the BCC, but implementation lags significantly behind pledges
Slow-growth birds require more feed per kg of output, increasing costs by approximately 10–20%

Welfare Considerations

The welfare toll of fast-growing broiler breeds is among the most significant in modern animal agriculture by sheer scale — tens of billions of birds annually experience chronic musculoskeletal pain, cardiovascular stress, and compromised mobility simply because of their genetics. Slow-growth breeds do not fully solve the underlying problem of raising any animal in high-density industrial conditions, but they substantially reduce suffering at the genetic baseline. The economic argument against transition — increased cost — is real but addressable through consumer willingness to pay premiums, retailer commitment, and regulatory mandates. Advocacy focused on holding companies to their BCC pledges represents one of the highest-leverage welfare interventions available.

What You Can Do

Buy chicken products labelled as meeting Better Chicken Commitment or equivalent higher-welfare standards
Contact retailers and food service companies that have signed the BCC but not yet implemented the growth rate standard
Support organisations like Humane Society International and Compassion in World Farming that lead BCC advocacy
Reduce broiler chicken consumption as the most direct welfare benefit you can deliver individually
Advocate for legislative maximum growth rate standards so that welfare does not depend solely on corporate voluntary action