Youngji Rho, Elijah Kiarie, and Cornelis (Kees) F. M. de Lange
Nutritive value of corn distiller’s dried grains with solubles steeped without or with exogenous feed enzymes for 24 h and fed to growing pigs
Youngji Rho, Elijah Kiarie, Cornelis (Kees) F M de Lange
The use of corn distillers dried grains with solubles (DDGS) in pig dietsis limited due to high fiber concentration. Steeping with exogenous fiber-degradingenzymes (FDE) may improve their feeding value. We evaluated apparent ilealdigestibility (AID), standardized ileal digestibility (SID), and apparent totaltract digestibility (ATTD) of components and DE content in DDGS steeped withoutor with two commercial FDE (A and B). Mixture of 350 g of DDGS, FDE (none forcontrol), and 1.5 liters of water was incubated at 40 °C for 24 h with 15 minagitation every 40 min. FDE-A (pure combination) supplied 5,500 U of xylanaseand 1,050 U of β-glucanase while FDE-B (multienzyme complex) supplied 1,200 Uof xylanase, 150 U of β-glucanase, 500 U of cellulase, and 5,000 U of proteaseper kg of DDGS plus side activities. Samples were taken at time 0, 4, 8, and 24h for organic acids and pH measurements. Three semi-purified corn starch–baseddiets were formulated with steeped DDGS as the sole source of CP. The basalmixture contained 0.2% TiO2 as indigestible marker. Six ileal-cannulated pigs(20 kg BW) were fed the three diets in a replicated 3 × 3 Latin square designto give six replicates per diet. Pigs were fed at 2.8× maintenance energyrequirements and had free access to water. In each period, pigs were adjustedto diets for 7 d followed by 2 d for grab fecal and 2 d of 8 h continuous ilealdigesta collection. There were no (P > 0.05) treatment and sampling timeinteraction or treatment effects on pH and lactic concentration. Lactic andacetic acids increased, and pH decreased (P < 0.05) over time points. TheAID of CP, NDF, and crude fat and SID of CP were not different (P > 0.05)among treatments. Steeping DDGS with FDE-A had lower (P = 0.01) ATTD of NDFthan control but higher (P = 0.001) ATTD of crude fat compared with the controlor DDGS steeped with FDE-B. Values for DE content in steeped DDGS were not different(P > 0.05) and amounted to 4,095, 4,039, and 3,974 kcal/kg DM for thecontrol, FDE-A, and FDE-B, respectively. In conclusion, under conditions of thestudy, steeping DDGS with exogenous enzymes did not improve fiber and energydigestibility.