Sanson (1993) found that average hay dry matter digestibility for lambs fed supplemental beet pulp was 3.7% greater than for lambs fed supplemental corn. It was concluded that the difference may have been a result of an improved ruminal environment for fiber digestion when beet pulp was fed, which was higher in digestible fiber. This finding concurs with work conducted by Poppi and McLennan (1995). However, other studies with corn as a supplement have shown a decrease in forage digestibility. Chase and Hibberd (1987) observed that digestibility of hemicellulose and cellulose decreased linearly as the amount of supplemental corn increased. Additionally, hay and fiber digestibility also decreased as the amount of supplemental corn increased. Supplementation with corn or other concentrate feeds can negatively affect fiber digestion.