Corn DDGS or stillage is a distillation by-product of ethanol production. There are two methods for producing ethanol from grains – dry mill and wet mill. The abbreviation DWGS (distillers’ wet grain with solubles) is used to describe the distillation residue from the dry processing of grains (dry milling), i.e. stillage (contains 10-15% dry matter).
The drying of the stillage results in DDGS (dried distillers’ grains with solubles). Dried stillage forms 30-40% the initial weight of the kernels. The stillage dry matter is of high nutritional value: it contains 2-3 times more protein, crude fat and crude fibre than kernels. Consequently, corn stillage dry matter contains 27% protein on average while the respective figure for kernels is only 9%. Crude fat also remains in the stillage after the dry processing of kernels (7-10% in corn stillage dry matter, 5-8% in wheat stillage dry matter).
High content of digestible crude fibre and moderate crude fat levels make this distillation by-product a high-energy feed. One kilogram of stillage dry matter contains 10-11 MJ of metabolic energy.
Eesti Viljasalv offers corn stillage in multiple levels of quality from the following countries:
1. Country of origin: the Netherlands, granulated, min. protein in dry matter 27%, max. moisture 12.5%, max. crude fibre 9%, max. crude fat 13%, metabolic energy 14 MJ/kg.
2. Country of origin: Poland, granulated, min. protein in dry matter 27%, max. moisture 13%, max. crude fibre 7%, max. crude fat 10%.