Crude fiber forms in the cell wall of plant products. Crude fiber provides energy for a longer period. Crude fiber acts as a stimulator for the intestines. Chewing roughage takes longer than chewing other feed. The dry matter must slide better through the stomach with the saliva produced during chewing. The saliva helps buffer stomach acid. Stomach acid is continuously produced in animals. Roughage keeps the animal busy, stimulates digestion, and prevents stomach ulcers, because the stomach acid is neutralized.