Nutritional Composition and Digestibility of Corn Ethanol Coproducts in Swine Feed: A Systematic Literature Review

Corn ethanol coproducts contain high concentrations of protein, lipids, and fiber; however, their nutritional composition and digestibility vary significantly across manufacturing processes. This study aimed to survey and synthesize literature data on corn ethanol coproducts and their effects on pig digestibility. A systematic search was conducted between August 2023 and October 2025 across databases, including Periódicos Capes, ScienceDirect, Web of Science, Scielo, and Google Scholar. The search targeted publications from 2010-2005 using keywords related to DDGS, pigs, energy, and amino acids. Among the 177 articles meeting the inclusion criteria, corn DDGS was the most common coproduct (359 observations), followed by wheat and sorghum. The results indicated that wheat DDGS had the highest protein and phosphorus contents, whereas corn DDGS presented higher crude fiber and NDF levels. Furthermore, corn DDGS provided the highest digestible and metabolizable energy values, with amino acid digestibility coefficients generally surpassing those of other sources. This updated database serves as a vital tool for improving the predictability of these ingredients in swine nutrition.