Scale: The Most Numerous Land Animal
Broiler (meat) chickens are the most numerous land animals on Earth at any given time. Approximately 70 billion are slaughtered annually — nearly 10 for every human being alive. They are also arguably the animals experiencing the most widespread, systemic welfare harm in the modern food system.
70B
Broilers slaughtered annually
~33B
Alive at any given moment
33–47
Days to slaughter weight (fast-growing)
~4x
Growth rate increase since 1950s
The Fast-Growth Breed Crisis
Modern broiler chickens — particularly breeds like Ross 308 and Cobb 500 — have been selectively bred over decades to grow as fast as possible, reaching slaughter weight in 33–47 days. A broiler in 1950 took about 84 days to reach slaughter weight. This four-fold acceleration in growth rate has come at enormous welfare cost.
Skeletal and Cardiovascular Problems
- Leg disorders: The most widespread welfare problem. Rapid muscle growth outpaces skeletal development, causing chronic leg pain, lameness, and inability to walk normally. Studies estimate 15–30% of commercial broilers experience significant lameness; some estimates are higher.
- Tibial dyschondroplasia: Cartilage growth disorder causing bone weakness and pain
- Valgus-varus deformity: Twisted legs making normal locomotion impossible
- Ascites (water belly): Cardiovascular disease — the heart and lungs cannot keep up with the oxygen demands of rapid muscle growth. Causes fluid accumulation and death
- Sudden Death Syndrome: Cardiac arrest, primarily affecting fast-growing males at peak growth
Chronic pain as the norm: Research using pain assessment (gait scoring, lameness evaluation, analgesic trials) consistently finds that a significant proportion of commercial broilers live with chronic musculoskeletal pain for much of their short lives. Fast-growing birds given analgesics move more — direct evidence they were in pain before treatment.
Hock Burns and Foot Pad Dermatitis
Because lame birds spend more time sitting on wet litter, hock burns (skin lesions on the hocks) and foot pad dermatitis are extremely common. These lesions are both painful and indicative of poor litter quality and mobility problems. Hock burn scoring is used as a welfare indicator in some assessment systems.
Housing Conditions
Commercial broilers are housed in large windowless sheds of 20,000–50,000+ birds. Key welfare concerns:
- Stocking density: Up to 42 kg/m² in some systems — birds at slaughter weight have barely room to stand without touching others
- Litter quality: Wet litter from ammonia-heavy excreta causes respiratory disease, foot and hock lesions, and eye problems
- Lighting: Historically near-constant low-light conditions to suppress activity and promote growth; most welfare standards now require minimum dark periods
- Enrichment: Conventional systems offer essentially no enrichment — no perches, no pecking objects, no complexity
- Air quality: Ammonia levels in poorly ventilated sheds cause respiratory damage and eye problems
Slaughter
Broilers are caught by hand or machine at night, placed in crates, transported to slaughter. Catching causes acute stress and injuries (wing fractures, bruising). At slaughter, live hang shackling (hanging conscious birds upside-down on a moving line) causes pain and distress. Water bath electrical stunning — the dominant slaughter method — is often ineffective, leaving birds conscious at neck-cut. Controlled atmosphere killing (CAK) using gas causes less distress but is not universally adopted.
The Better Chicken Commitment
The Better Chicken Commitment (BCC) is a set of welfare standards championed by major animal welfare organisations. It requires companies to:
- Switch to slower-growing breeds (targeting <25% daily live weight gain, or breeds approved by an independent expert panel)
- Reduce maximum stocking density to 30 kg/m²
- Provide minimum 6 hours darkness per day
- Provide enrichment (at minimum: litter, perches, pecking objects)
- Adopt improved slaughter methods (controlled atmosphere killing)
- Provide third-party auditing
Progress: Over 200 major companies globally have signed the BCC, including major retailers in Europe, the US, and internationally. Implementation timelines typically run to 2026–2030. When fully implemented, the BCC would substantially reduce broiler suffering for billions of birds annually.
| Company Type | BCC Signatories (examples) |
|---|
| Foodservice | Compass Group, Sodexo, Aramark |
| Retail | Whole Foods, M&S, Waitrose, ALDI (some regions) |
| Restaurant | Subway, Nando's, Burger King (some regions) |
What You Can Do
- Reduce or eliminate chicken consumption — the single most impactful dietary choice for broiler welfare
- Choose higher-welfare certified chicken (RSPCA Assured, Global Animal Partnership 3+, organic) when buying
- Contact supermarkets and restaurants to ask about their BCC commitments and timelines
- Support organisations running BCC campaigns (The Humane League, Open Wing Alliance)
- Donate to effective animal welfare organisations working on broiler issues
Broiler Chickens
Fast-Growth Breeds
Better Chicken Commitment
Lameness
Hock Burns
Poultry Welfare
Stocking Density