When the protein content of the forage is high (> 10% crude protein), grains or low-protein supplements (< 20% CP) can be used. Henning et al. (1980) reported that low levels of corn supplementation (7.8% of DM intake) actually increased forage intake. However, with higher levels of corn supplementation (greater than 23% of DM intake), forage intake reduced compared to that of control sheep. Reports that low levels of energy supplementation increased forage intake seem to occur more frequently in studies with sheep than in those with cattle (Caton and Dhuyvetter, 1997). Horn and McCollum (1987) have suggested that an energy supplement level that would minimally affect forage intake would be 0.7% of animal body weight. However, level of grain supplementation can vary with forage quality.