Broiler Chicken Growth Rates and Leg Health

Modern broiler chickens have been bred for extreme growth rates that cause widespread leg disorders, chronic pain, and cardiovascular disease in billions of birds annually.

Key Facts

Modern broilers reach slaughter weight in 35-42 days compared to 84 days in the 1950s
Studies show 25-30% of commercial broilers experience gait problems serious enough to affect welfare
Lameness causes pain and reduces access to feed and water, compounding suffering
Breast muscle hypertrophy causes myopathy conditions including woody breast in many birds
Slower-growing breeds show dramatically lower rates of leg and cardiovascular disorders
The European Chicken Commitment requires slower-growing breeds or equivalent welfare certification

Welfare Considerations

The body of a modern broiler chicken has been reshaped by selection pressure to grow so fast that the skeletal, cardiovascular, and immune systems cannot keep pace. Lame birds experience chronic pain and reduced ability to access resources in crowded houses. This is a systemic welfare problem affecting the majority of the approximately 70 billion chickens slaughtered globally each year.

What You Can Do

Look for chicken products certified under higher-welfare standards like GAP 3+ or equivalent
Support food companies that have signed the European Chicken Commitment or similar pledges
Reduce chicken consumption or shift to products from slower-growing breeds
Advocate for regulatory minimum welfare standards for broiler genetics and housing