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Plasma β-hydroxy-β-methylbutyrate (HMB) concentrations in piglets fasted overnight and then fed low-protein diets supplemented with 2 (LP + HMB2), 20 (LP + HMB20), or 40 (LP + HMB40) μmol/kg body wt HMB or water with 40 μmol/kg HMB (H2O + HMB40). Values are means ± SE; n = 3–4.
