Two cows were fed sugarcane silage as high fiber roughage (HF) and the other two cows were fed oaten hay as low fiber roughage (LF), along with soybean meal [0.5 g/kg BW on a dry matter (DM) basis]. The aNDFom and peNDF contents were different (718 vs. 542 g/kg DM and 554 vs. 402 g/kg DM, respectively), whereas the physical effectiveness factors (pef) was similar between sugarcane silage and oaten hay (771 vs. 741 g/kg DM).