Stereotyped behaviour, social interactions and suckling pattern of pigs housed in groups or in single crates (1992)

Arellano, P. E., Pijoan, C., Jacobson, L. D. et al.

Abstract

Our observations confirm that providing straw and space for exercise reduced the frequency of stereotypies (14.9 per sow-hour), but did not completely suppress them (0.3 per sow-hour). ... Sows in crates demonstrated more stereotypies, whereas sows in pens had more peaceful interactions.