Table 2. The mutually exclusive behavioral categories used for behavioral observation.

Behavior	Definition
Sow
Lateral recumbency	Lying on side with one shoulder completely touching the ground, which included nursing
Ventral recumbency	Lying on udder with neither shoulder touching the ground
Sitting	Partly erect on extended front legs with the caudal end of body contacting the floor
Standing	Upright with all four feet on the ground
Feeding and drinking	Lowering head into the feeder and Touching the nipple water drinker with snout
Piglet
Lying	Combined category of lying laterally and lying ventrally
Walking	Relatively low speed locomotion on the ground in which propulsive force derives from the action of legs, which included standing and sitting
Suckling	Successfully switching from teat massage and slow suckling movements to the rapid, regular suckling movements indicative of milk ingestion