Effects Of Distillers Dried Grains With Solubles On Meat Quality, Antioxidant Capacity And Immunity Of Immunosuppressed Broilers

By-product distillers dried grains with solubles (DDGS) in ethanol productionpromotes the use in livestock feed. In addition, DDGS, which enrichs insoluble fiber,beta-glucans, mannan-oligo-saccharides, may enhance immunity and improve intestinalhealth.The objective of the present research was to investigate the effect of dietary DDGSon meat quality, antioxidant capacity and immunity of DEX-induced immunosuppressivebroilers.300one-day-old Cobb500broiler chicks were randomly allocated into twotreatments with6replicates (n=25). Chicks had ad libitum access to water and anonmedicated corn-soybean based diet in mash form containing0,15%DDGS. On the23thday of broiler chicks, all the treatments were randomly divided into two groups (A, B).Subsequently, the group B was injected into abdomen s. c. with DEX (3mg/kg· BW) for3times every other day, while the group A was injected with saline and served as control. Theresults were shown as follows:(1) Compared to normal broilers, immunosuppressive broilers had lower dailygain(P<0.05). However, no significance in daily feed intake, daily gain and feed efficiencywere observed when boilers fed15%DDGS diet compared to that of broilers fedcorn-soybean meal diet(P>0.05).(2) Dietary DDGS significantly increased newcastle disease antibody level, IL-6、IFN-γ、IgA and IgG content of broilers before DEX injection(P<0.05). Compared to normalbroilers, immunosuppressed broilers had lower immune organ index and decreased theexpression of IL-6and IL-10in spleen(P<0.05), but DDGS significantly increased theexpression of IL-4and IL-6in spleen(P<0.05).(3) During DEX-injection, DEX treatment significantly increased abdominal fatpercentage, liver index, and lightness (L*)(P<0.05), while the DEX treatment had nosignificant influence on pH45min, pH24h, shear force, water-loss rate, redness (a*) andyellowness (b*) of breast muscle (P>0.05).Dietary DDGS significantly enhanced water-loss rate and L*(P<0.05).After DEX-injection, the DEX treatment significantly increasedabdominal fat percentage (P<0.05). However, the DEX treatment had no significant effecton pH, shear force, water-loss rate and color of breast muscle (P>0.05).Dietary DDGSsignificantly enhanced shear force and water-loss rate (P<0.05).(4) During DEX-injection, the DEX treatment significantly declined the expression ofGPX in spleen, serum T-AOC activity and MDA content (P<0.05), but significantilyenhanced serum GSH-Px activity(P<0.05). After DEX-injection, the DEX treatmentsignificantly declined serum GSH-Px activity and T-AOC activity (P<0.05). Furthermore,serum T-AOC activity was significantly suppressed by dietary DDGS during DEX injectionand after DEX injection(P<0.05). During DEX injection and after DEX injection, there wasno significant influence on GSH-Px、T-AOC、T-SOD activity and MDA content in theliver(P>0.05).Conclusion, Immunosuppression significantly depressed growth performance, meatquality, immunity, antioxidant capacity in broilers. Dietary DDGS diets could modulateimmunity of broilers, reduced meat quality and antioxidant capacity, whereas no significanteffect on growth performance was observed.