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This study evaluated the effects of a liquid prototype (LIQP) and dry (XPC®; Diamond V) Saccharomyces cerevisiae feed additives on blood and uterine cytokine profiles in sows (n = 40). On d 112 of pregnancy sows were allotted to dietary treatments: 1) Control diet (CON), 2) CON +15 mL of LIQP (LIQ), 3) CON +0.20% of XPC (DRY), and 4) DRY +15 mL of LIQP until d 7 post-farrowing (D+L). Interleukin (IL)-1β, IL-4, IL-6, IL-8, IL-10, tumor necrosis factor-α (TNF-α), and interferon-γ (IFN-γ) were quantified from serum samples collected on d 112 of gestation, d 2 and 6 post-farrowing, and from uterine fluid collected on d 2, 4, and 6 post-farrowing. Serum C-Reactive protein (CRP) and haptoglobin concentrations were evaluated. No interactions between treatments and day of collection were observed (P &amp;gt; 0.13). LIQ and D+L sows had the greatest serum IL-10 concentration (P &amp;lt; 0.001) and sows fed CON tended to have lower concentration of IL-8 (P &amp;lt; 0.06) vs. other treatments. Serum CRP concentrations were greatest on d 2 (P &amp;lt; 0.001), serum IL-10 (P &amp;lt; 0.04) and IL-4 (P &amp;lt; 0.07) linearly decreased while serum haptoglobin (P &amp;lt; 0.02) and INF-γ (P &amp;lt; 0.001) linearly increased post-farrowing. In the uterine fluid, LIQ and D+L sows had greater INF-γ (P = 0.04) concentrations and CON tended to have the least concentration of TNF-α (P = 0.08). Uterine fluid IL-1 tended to linearly increase (P &amp;lt; 0.07) and IL-6 linearly decrease (P &amp;lt; 0.01) post-farrowing. No strong correlations were detected between cytokines in the serum and uterine fluid within day. LIQ sows had the greatest daily feed intake and CON the least during the first week of lactation (P = 0.04). Providing LIQP post-farrowing to sows modified immune response increasing both pro- and anti-inflammatory cytokines in serum and uterine fluid in an independent manner, allowing animals a quicker recovery and increased feed intake.

259 Effects of Saccharomyces Cerevisiae Fermentation Products on Lactating Sow’s Blood and Uterine Cytokine Profiles