摘要: Structural polymers of plants (mainly cellulose and hemicellulose) are possibly the most widely available sources energy from primary producers for herbivores (Parra 1978). However, such highly fibrous diet components extremely difficult to digest and, therefore, possess specific adaptations digestion these materials. The best-known, undoubtedly common, adaptation a high-fiber among mammals is fermentation by symbionts (bacteria, fungi, protozoa), coupled with mechanisms absorption products fermentation. Symbionts themselves thrive on large amounts vegetation swallowed herbivore.