Overall, the nutrient digestibility and retention of laying hens fed diets containing cassava pulp and Napier Pakchong grass up to 20% were comparable to laying hens fed the control diet (Table 2). The combination of cassava pulp with Napier Pakchong grass can improve the CP contents compared to the regular cassava pulp (Table 1). Although the CF in mixed product was increased but it did not interfere to lower nutrient digestibility and retention. Probably due to the experimental diets were added the fibrolytic enzymes, which compose of endo-1,4-β-glucanase, endo-1,3(4)-β-glucanase and endo-1,3(4)- β-glucanase xylanase. This would help to digest CF and thus reduce the negative effect on lower nutrient digestibility (Mathlouthi et al., 2002).