The majority of the 950 million chickens farmed each year in the UK for food are bred to grow so fast millions of them are dangerously heavy for their age, struggle to walk properly and can suffer from heart defects.
The issue - highlighted by Jamie Oliver and Jimmy Doherty on Jamie and Jimmy's Friday Night Feast (27 Jan, 2017) - is considered the most serious welfare problem facing chickens today, according to the RSPCA.