Although diets were originally formulated to contain 12% CP in the low protein diet and 16% CP in the high protein diet, CP contents of the experimental diets actually fed in the present experiment averaged 12.0, 16.2, 12.5 and 15.7% DM for LCGM, HCGM, LSBM and HSBM, respectively.
Thus, although not determined in the present study, microbial growth for LCGM may be limited due to ammonia N concentration being less than 33 mg/L at 5 h post-feeding (Figure 1B).
As a result, both HCGM and HSBM supplied more RDP than LCGM and LSBM, respectively (Table 2).