A method for producing an improved livestock feed mixture. The method has the steps of adding zeolites and/or activated carbons to the byproducts of ethanol production and/or other fermentation processes. The addition of the zeolites and/or activated carbons extends the shelf life of the feed mixture prior to consumption by livestock. Further, vitamins, minerals and/or other substances may be added to the zeolites and/or activated carbons to further increase the nutritional value of the feed mixture. The method results in a consistent feed mixture produced from the byproducts of ethanol production and/or other fermentation processes.