Trials conducted in Madera County with corn silage and oat and vetch silage indicated that treatment with a popular silage additive resulted in no discernable differences between treated and untreated silages. The silages were analyzed for pH (acidity) and percentage of dry matter, crude protein, crude fiber, ether extract and ash. In addition, observation of the treated and untreated silages revealed no differences in color, odor, amount of seepage, and cow acceptance.