In 1965, the UK government commissioned an investigation—led by Professor Roger Brambell—into the welfare of intensively farmed animals, partly in response to concerns raised in Ruth Harrison's 1964 book, Animal Machines.
Den britiske regering bestilte i 1965 hos professor Roger Brambell en undersøgelse af velfærd hos intensivt opdrættede dyr som følge af Ruth Harrisons bog Animal Machines fra 1964.