The use of different types of fungi or bacteria as an agent in SSF by several researchers has showed different results on the nutrient contents of PKC. In a study conducted by Ramin et al. (2010) using three different fungi species: Aspergillus niger, Trichoderma harizianum and Rhizopus oryzae in SSF of PKC, they reported that A. niger or R. oryzae were two potentially effective fungal species which could improve the nutrient content of PKC, but the other two fungi did not. The treatment improved the concentration of CP and reduced the NDF and ADF values. The result appeared to be in line with observations by Ng et al. (2002), where they reported Trichoderma koningii almost doubled the protein content of PKC. The nutrient analysis of raw PKC and fermented PKC from different fungal strains is shown in Table 5.