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The concentrations of IL-1a (A), IL-2 (B), IL-10 (C), IL-1b (D), IL-4 (E), IL-12 (F), IL-1RA (G), IL-6 (H), IL-18 (I), TNF-a (J), IL-8 (K), and IFN-g (L) in serum of pigs with/without HS. Values are means (n = 8/group), with their standard errors represented by vertical bars. a, b Mean values with unlike letters are statistically significant (P < 0.05). TN = thermoneutral; HS = heat stress; PF = pair-fed; IL = interleukin; TNF-α = tumor necrosis factor-α; IFN-γ = interferon-gamma.
