The nutrient composition ofthe 2 sources of FFRB used in this experiment was similar, exceptfor the concentration of acid
hydrolyzed ether extract and starch, which were greater in FFRB-2 than in FFRB-1. This is likely the reason for the increased
GE in FFRB-2 compared with FFRB-1. The concentrations of acid hydrolyzed ether extract, CP, and AA in the FFRB used in
this experiment were in agreement with values reported by NRC (2012), but less than observed by Kaufmann et al. (2005).
However, concentrations of neutral detergent fiber and acid detergent fiber in both sources of FFRB were less than reported
in the literature (Sauvant et al., 2004; NRC, 2012)