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What happens to farm animals

Farm animals are killed in numbers that are hard to hold in mind. More than 86 billion land animals were slaughtered for meat in 2024, and about nine in ten of them were chickens, by UN figures [1]. Those chickens have been bred to grow so fast that in a survey of 51,000 birds in commercial flocks (2008), more than a quarter walked poorly at an average age of 40 days and 3.3% could barely walk at all [2]. Are chickens raised for meat treated humanely? follows them from the shed to the slaughter line.

At slaughter, 90% of pigs in England and Wales were stunned with high-concentration carbon dioxide in 2024, a method the UK government’s own Animal Welfare Committee (2025) says causes pain, respiratory distress and fear before the pigs lose consciousness, and wants prohibited [3]. The answer to Is humane slaughter possible? explains what the gas does and why it is still used.

Free-range and higher-welfare farming can ease an animal’s life but still end it young, and Is humane, free-range meat ethical? sets what the labels promise against what they leave out. The answers below follow each species in turn, from hens and dairy cows to sheep, fish and ducks, then slaughter itself and the animals used in testing, zoos and entertainment.

Chickens and eggs

Cows, dairy and veal

Sheep, wool, leather and fur

Fish

Ducks, bees, crabs and insects

Free-range, humane labels and slaughter

Testing, zoos and entertainment

Sources

  1. Our World in Data, from UN Food and Agriculture Organization data, Yearly number of animals slaughtered for meat (2024 figures, updated February 2026) (opens in a new tab) (data)
  2. Knowles et al. (2008), Leg disorders in broiler chickens: prevalence, risk factors and prevention, PLOS ONE (opens in a new tab) doi:10.1371/journal.pone.0001545 (opens in a new tab) (study)
  3. Animal Welfare Committee (2025), Opinion on the welfare impacts on pigs of high concentration CO2 gas stunning and of potential alternative stunning methods, UK Government (opens in a new tab) (official)