Behavioral observations were carried out by the same observer
according to a scan sampling procedure.. The behavior of the sow and
all her piglets (both postures and activities) was scored, and then the
observer moved on to the next litter and scored behavior (postures
and activities) of those piglets and sow (Gustafsson et al., 1999; Hay
et al., 2003; Llamas Moya et al., 2008; Baxter et al., 2011)