Bioenergy Co-products as Swine Feed Ingredients:
Combining DDGS and Glycerol
Bioenergy production generates two major coproducts—distillers dried grains with solubles (DDGS) from ethanol plants and crude glycerol from biodiesel plants. We need to evaluate whether these co-products, DDGS and glycerol, can be fed in combination to partially meet the feed energy needs of growing pigs. If successful, the diet with 25% DDGS and 10% glycerol has the potential to reduce corn feeding to market pigs by 40+%. The objective was to evaluate feeding crude glycerol and DDGS in combination to market swine. At the processing plant, a fat sample was taken from the jowl of each pig. The fat sample was analyzed for fatty acids. Pig performance and carcass traits did not differ between diets. Fatty acid composition showed differences based on the dietary treatments. Saturated fatty acids were highest for diets with the most corn and least DDGS – the corn-soy and 10% glycerol diets (P < 0.01). Mono unsaturated fatty acids were highest for the 10% glycerol diet and decreased as DDGS was added with the lowest value for the 25% DDGS diet (P < 0.01). Poly-unsaturated fats were lowest for the corn-soy and 10% glycerol diets and highest for the 25% DDGS diets (P < 0.001). The results of this study show that pig performance was not affected by the addition of DDGS and crude glycerol. The amount of corn fed can be reduced by the addition of DDGS and glycerol. DDGS increases the unsaturated fatty acids in pork fat. Crude glycerol addition partially offsets the DDGS fatty acid effect by reducing polyunsaturated fatty acid content.