How do I know what the nutrient levels are in purchased corn co-products?
The only sure way is to have them tested at an analytical laboratory. Work at South Dakota State University has shown that distillers grains do have variation from plant to plant, but also within the plants. For instance, distillers dried grains with solubles had an average crude protein (dry matter basis) of 33.3% and a standard deviation of 2.78%. This means that about 85% of the samples would range from 27.7 to 38.6% crude protein.
