WDGS can be sold to nearby animal operations for feed or dried to produce DDGS. It is
necessary that the WDGS, also called ‘wet cake’ when sold in this form, be fed to the animals within a week or two of production, because it readily spoils. The selling of wet cake, or WDGS, is not nearly as common as the selling of DDGS. The drying of DDGS takes place in rotary dryers that are known as ‘drum dryers’ that require a good deal of thermal energy, almost a quarter of the thermal energy used in ethanol production. The moisture content is reduced from 60% in WDGS to levels of nearly 10% in DDGS. The DDGS are stored until they are ready to be shipped to feed yards. This feed is high in protein, calories, and is an especially useful feed for cattle and other ruminants due to its by-pass protein content.