The effect of barren and enriched housing environments on the interactive behaviour of pigs (1995)

Haskell, M., Wemelsfelder, F., Mendl, M. et al.

Abstract

Barren [individually housed] pigs spent longer chewing with no substrate in the mouth and longer interacting with the feeder and pen fittings than individually housed pigs who had access to straw, pine bark and branches.