Modern fast-growing broiler breeds can reach slaughter weight in 35-42 days but often suffer from lameness, heart failure, and chronic pain.
Fast-growing broiler breeds often experience chronic leg pain that limits mobility and prevents normal behaviour including foraging and dustbathing. Birds unable to walk properly spend excessive time lying in litter, causing hock burns and breast blisters. The cardiovascular strain of rapid growth causes heart failure and sudden death. These welfare problems are systemic and breed-related, not primarily management failures, requiring industry-level breed reform.