Concentrations of liver metabolites regulated between 5-week-old pigs orally administered either vehicle (group CON) or pivalate (group PIV) for 28 days as identified by targeted plasma metabolomics. Bars are means ± SD for n = 6 pigs/group. Abbreviations: C, carnitine; C0, free carnitine; C2, acetylcarnitine; C3, propionylcarnitine; C3-DC (C4-OH), malonylcarnitine (3-hydroxybutyrylcarnitine); C4, butyrylcarnitine; C5, isovalerylcarnitine, valerylcarnitine, 2-methylbutyrylcarnitine and/or pivaloylcarnitine; C5-OH (C3-DC-M), hydroxyvalerylcarnitine (methylmalonylcarnitine); C7-DC, pimelylcarnitine.