Inbred line W606S, W607S, W608S, W609S and W610S were developed from breeding populations provided by the USDA Germplasm Enhancement of Maize (GEM) project. Table 1 describes the specific populations, pedigree and year when inbred development for these populations was initiated. These lines were selected for nutritional composition on a hybrid topcross bases during inbreeding. W606S, W607S, W608S and W609S combine well with inbreds from the Stiff Stalk heterotic group. W610S, on the other hand, combines well with inbreds from the Non-Stiff Stalk heterotic group.