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Confinement and a lack of enrichment for animals in "intensive farming" amplifies the effects of physical pain. Breeding pigs in particular are often kept in crates which they cannot turn around in, leading to chronic stress, increased pain sensitivity and slower healing.

Schuck-Paim, C., Alonso, W. J., Hartcher, K., Chiang, C., Alves Pereira, P., Veit, W.

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