Enhancing the Nutritive Value of Corn Whole Stillage for Pigs via Pretreatment and Predigestion

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Abstract
: Corn DDGS is poorly digested by pigs. Pretreatment or pre-digestion of whole stillage (WS; slurry material from which DDGS is derived) can potentially improve corn DDGS digestibility. Thus, a study was conducted to determine the effects of pretreating WS with heat (160oC and 70 psi for 20 min) alone or in combination with citric acid (10 g/L; CA), sulfuric acid (90 mM; H2SO4) or ammonia (1%), without or with subsequent multi-enzymatic hydrolysis for 24 h, on porcine digestibility. Dried untreated, heat-pretreated, CA-pretreated, H2SO4-pretreated, and ammonia-pretreated WS contained 23, 21, 12 19, and 18% total non-starch polysaccharides, respectively. Pre-treatment increased in-vitro digestibility of dry matter of WS by ~11 (CA) to ~15% units (ammonia). Multi-enzyme hydrolysis increased in-vitro digestibility of dry matter of WS by ~6 (ammonia-treated WS) to ~18% units (untreated WS). Thus, pretreatment or pre-digestion can improve the digestibility of WS and hence the resulting DDGS.
Funding Information
  • South Dakota State University
  • Canadian Bio-Systems Inc.

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