Abstract: This invention provides a process for the preparation of a ruminant dietary product comprising a blend of fatty acid salt and denatured protein. In the process, whole proteinaceous oilseed in particulate form is treated with a basic alkaline earth metal compound. The oil content of the oilseed is saponified to a fatty acid salt, and the protein content is denatured into a water-insoluble form. The fatty acid salt and denatured protein ingredients of the invention ruminant dietary product have rumen-bypass properties, and are metabolized in the post-rumen digestive tract under ruminant feeding conditions.