Cow-calf producers are asking questions concerning the use of wet distillers grain in their operations. Most small to moderate sized cow-calf producers cannot use a semi-load of wet distillers grain fast enough before it spoils, therefore, methods for extended storage are needed to use this product in their operation. Previous feedlot work suggested distillers grain are excellent sources of nutrients for the diets of feedlot cattle, but have not been used to a large degree in heifer development programs. The goal of this trial was to evaluate the use of modified distillers grain with solubles mixed with ground hay and stored for an extended period of time with growing and developing breeding heifers.