When grass hay was used to bag wet distillers grains, it was determined that the optimal mixture was 15% grass hay and 85% wet distillers grains on a dry matter basis. If we assume that wet distillers grains are 65% moisture (35% dry matter) and the grass hay is 15% moisture (85% dry matter), one can calculate the amount of grass hay and wet distillers grains needed to make up a ton of this mixture on an “as-ensiled” basis. A ton of this mixture on a dry matter basis would be 1,700 pounds (2000 lb x .85) of wet distillers grains and 300 pounds (2000 lb x .15) of grass hay. Converting these numbers to an “as-ensiled” (adjusting the feeds for their water content) basis, the mixture would include 4,857 pounds of wet distillers grains that are 35% dry matter (1,700 lb/.35) and 353 pounds of grass hay at 85% dry matter (300 lb/.85). With these number, the percentage of each of the two feeds needed in a ton of the mixture to get 85% wet distillers and 15% grass hay can be calculated. The total as-ensiled mixture of the two feeds is 5,210 pounds (4,857 lb from wet distillers grains + 353 lb from grass hay). As a percentage of the total, wet distillers grains are 93% [(4,857 lb/5,210 lb) x 100] and grass hay is 7% [(353 lb/5,210 lb) x 100]. Understanding the calculations is critical because it illustrates the need to know the moisture content of the wet distillers grains and the grass hay. To mix a ton of wet distillers grains and grass hay so that the mix is 85% distillers and 15% grass hay, the mix would contain 1,860 lb of wet distillers grains (2000 lb x .93) and 140 lb of grass hay (2000 lb x 0.07).