Not all distillers grains are created equal. Distillers grains could be made from 100 percent corn or a 51-percent-corn, 49-percent-sorghum mix, explains Gerald Poppy, veterinarian with Diamond V in Fort Collins, Colo. In addition, some ethanol plants fractionate the corn to remove the starch before it enters the fermenter, which results in more protein, less phosphorus and less fat in the distillers grains. It’s important to know what you are buying so you can minimize variation in the diet.