Table 1.

The six pig behaviours manually annotated for both trials using Elan version 5.2 software

Behaviour	Description
Standing	Pig only has feet (and possibly snout) in contact with pen floor
Lying	Trunk of the pig is in contact with the floor
Feeding	Pig has head inside a food trough
Drinking	The pig’s snout is in contact with a nipple drinker
Non-nutritive visit (NNV)	Pig enters the black mat of the feeding area with two or more feet (one must be a front foot), then leaves the area without putting head in food trough
Enrichment interaction	Pig uses its head to bite, nose, or knock the plastic pipe and chain suspended from the ceiling