Energy utilization of reduced oil-dried distillers grains with solubles (RO-DDGS) in swine

Brian J. Kerr,* Thomas E. Weber,* and Michael E. Persia†

*USDA-ARS-NLAE, Ames, Iowa 50011; and †Iowa State University, Ames, Iowa 50011

The ethanol industry produces a variety of co-products, ranging from dehydrated corn germ meal to corn bran, with typical DDGS being approximately 31% CP, 12% ether extract (EE), and 44% neutral detergent fiber (NDF) on a DM basis. With the ethanol industry seeking alternate profit streams from ethanol plants and the biodiesel industry seeking alternatives to high-priced soybean oil, one potential product is corn oil extracted from existing ethanol plants. In extracting the oil in DDGS, crude fat levels can drop from approximately 12% to 6% EE (as-is basis), while the concentration of other nutrients in the resultant OE-DDGS are increased. Based upon past research, the increases in CP, NDF, and ash, would likely contribute to a lower metabolizable energy (ME) value to growing pigs. To date, however, there are only 2 reports on the energy value of an OE-DDGS (2,976 and 3,650 kcal ME/kg DM) which are less than the estimated 3,812 kcal ME/kg DM for DDGS and the 3,953 kcal ME/kg DM for corn. Because it is not known if the decrease in EE in OE-DDGS results in a linear drop in ME, research is needed to quantify the impact of reducing oil in DDGS on the ME in growing pigs.