Table 1 shows the chemical compositions of MUP, the mixture of concentrates and rice straw used during the four experimental periods. MUP was formulated with mulberry leaf meal 820 g/kg DM and urea 100 g/kg DM; hence MUP contained high CP up to 487 g/kg DM and low in aNDF (204 g/kg DM). On the other hand, rice straw contained lower quality in terms of low CP and high aNDF (39 and 759 g/kg DM, respectively).