By Ryan Samuel
Corn-fermented protein (abbreviated as CFP) derived from dry-mill bioethanol production has demonstrated potential as a high-quality protein ingredient in weaned pig diets. In previous research, it was shown that high-protein, corn-fermented products have greater digestibility and metabolizable energy content compared to distiller's dried grains with solubles (abbreviated as DDGS) and corn products. As an excellent source of lysine and methionine for young pigs, CFP can have up to 50% protein and 25% yeast. Benefits of CFP for the weaned pig due to the fermentation process include improved protein digestibility, increased energy digestibility, as well as a reduction in crude fiber levels compared to non-fermented protein sources.
Research from the University of Illinois has demonstrated that corn-fermented products have higher crude protein and amino acid (abbreviated as AA) content than soybean meal. Their findings resulted in similar standard ileal digestibility values comparing two levels of CFP and soybean meal. The CFP products contained greater concentrations of standardized ileal digestible AA (except arginine, lysine, tryptophan, and aspartic acid).
Because of the difference in the starting product (corn versus soybeans) and the desired end product (ethanol versus soy oil), corn-fermented protein and soy protein concentrate are processed differently. Corn fermentation involves using specific microorganisms, such as yeast or lactic acid bacteria, to convert the starches in corn into various compounds, including alcohol, organic acids, and gases. The fermentation process adds flavors, textures, and nutritional benefits to corn-based products. In contrast, soy protein concentrates are produced by extracting protein from defatted soybean meal using solvents or other methods. The extracted protein is then concentrated to increase its protein content. Starter diets for weaned pigs typically include specialty protein products to provide a higher concentration of protein and energy than grower diets, as young pigs have higher requirements for these nutrients to support growth and development.