In just the same way, decreasing crude fiber content of biologically treated corn stalks may be a consequence of the utilization of CF by fungi (Kim et al., 1985). This proposition is reinforced by Grajek (1988) and Garcia et al. (1993), who stated that increase protein content of biologically treated corn stalks may be due to release of water soluble sugar from polysaccharides leading to faster growth of fungus which in turn resulted in higher CP content.