Modern broiler breeds have been selected for extreme growth rates that cause significant health and welfare problems.
The extreme growth rate of modern broiler breeds creates a fundamental conflict between production efficiency and animal welfare. Birds grow so fast that their cardiovascular and skeletal systems cannot keep pace, leading to heart failure, leg deformities, and chronic pain. Studies show broilers prefer to eat analgesic-laced feed when lame, demonstrating they experience pain. The suffering affects enormous numbers of animals making this one of the most significant welfare issues globally.