Blood 5-HT measures at 8 (T1), 9 (T2) and 22 (T3) weeks of life and given per type of pig (with respect to tail biting) in enriched housing over three phases of life (weaner, grower, finisher) post-weaning^a.

aUntransformed LSmeans. LSmeans lacking a common letter differ by P<0.05 (a/b) or P<0.10 (y/z). bWhole blood 5-HT level in nmol/ml; Platelet 5-HT level in nmol/platelet 109; Platelet 5-HT uptake velocity in pmol/platelet 109/min. cB = Main effect of tail biter; V = Main effect of victim; B×V = Interaction between main effects resulting in Biter, Victim, Biter/Victim and Neutral. −Not tested. +P<0.10. *P<0.05. **P<0.01. ***P<0.001. Blood 5-HT measures at 8 (T1), 9 (T2) and 22 (T3) weeks of life and given per type of pig (with respect to tail biting) in enriched housing over three phases of life (weaner, grower, finisher) post-weaninga.