In vitro unfermented fiber is a good predictor of the digestible and metabolizable energy content of corn distillers dried grains with solubles in growing pigs

Zhikai Zeng, Jae Cheol Jang, Brian J. Kerr, Gerald C. Shurson, Pedro E. Urriola

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Characterizing fiber into fermentable and unfermentable fractions may enhance the accuracy of estimating DE and ME energy content in fiber-rich ingredients. Therefore, the objective of this study was to analyze the concentrations of NDF, representing both the fermentable (fNDFom) and unfermentable (uNDFom) portions among sources of corn distillers dried grains with solubles (DDGS), and determine their relative contributions to DE and ME content. The concentrations of DE and ME, as well as apparent total tract digestibility (ATTD) of GE, were measured in a previous experiment. Samples of DDGS (0.5 g) were mixed with fecal inoculum and incubated for 8, 12, and 72 h. The ash corrected NDF (NDFom) content of DDGS residues at each time point was determined. The fNDFom increased with fermentation time of 8 h (21.6%), 12 h (29.0%), and 72 h (68.6%). The ATTD of GE increased as the uNDFom decreased at 8 h (uNDFom8; R2 = 0.83; P < 0.01) and 72 h (uNDFom72; R2 = 0.83; P < 0.01). Likewise, ME content of DDGS increased as uNDFom72 decreased (R2 = 0.59; P < 0.01). The best-fit DE equation was DE (kcal/kg DM) = 2,175 - 3.07 × uNDFom8 (g/kg, DM) - 1.50 × uNDFom72 (g/kg, DM) + 0.55 × GE (kcal/kg DM) (R2 = 0.94, SE = 36.21). The best-fit ME equation was ME (kcal/kg DM) = 1,643 - 2.31 × uNDFom8 (g/kg, DM) - 2.54 × uNDFom72 (g/kg, DM) + 0.65 × GE (kcal/kg DM) - 1.42 × crude protein (g/kg DM) (R2 = 0.94, SE = 39.21). These results indicate that in vitro unfermented fiber is negatively associated with GE and NDF digestibility, and therefore, is a good predictor of DE and ME content in corn-DDGS.

Original languageEnglish (US)
Pages (from-to)3460-3471
Number of pages12
JournalJournal of animal science
Issue number8
StatePublished - Aug 1 2019

Bibliographical note

Funding Information:
1Financial support was provided by National Pork Board (#17–036). Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the University of Minnesota or the USDA. The USDA is an equal opportunity provider and employer. 2Corresponding author: [email protected] Received October 14, 2018. Accepted June 28, 2019.

Publisher Copyright:
© 2019 The Author(s) 2019. Published by Oxford University Press on behalf of the American Society of Animal Science. All rights reserved.


  • corn distillers dried grains with solubles
  • energy prediction
  • fermentable fiber
  • growing-finishing pigs
  • in vitro fiber fermentation
  • metabolizable energy
  • Dietary Fiber/metabolism
  • Diet/veterinary
  • Zea mays/chemistry
  • Swine/metabolism
  • Digestion
  • Fermentation
  • Animal Feed/analysis
  • Animals
  • Energy Metabolism
  • Edible Grain
  • Feces/chemistry
  • Gastrointestinal Tract/metabolism

PubMed: MeSH publication types

  • Journal Article


Dive into the research topics of 'In vitro unfermented fiber is a good predictor of the digestible and metabolizable energy content of corn distillers dried grains with solubles in growing pigs'. Together they form a unique fingerprint.

Cite this