. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . dex of Lignificacion (LigninxlOO/ Acid detergent fiber) Figure 3. Relationship between lignification (lignin X 100 + acid detergent (fiber) and digestibility of cell-wall components. Forage was the only or main component of the diet in all cases. The meaning of symbols and the source of the data are as follows: H Horse. Fonnesbeck (1968); Hintz, personal communication (1973). Z Zebra. Hintz, personal communication (1973). PZ Przewa
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . dex of Lignificacion (LigninxlOO/ Acid detergent fiber) Figure 3. Relationship between lignification (lignin X 100 + acid detergent (fiber) and digestibility of cell-wall components. Forage was the only or main component of the diet in all cases. The meaning of symbols and the source of the data are as follows: H Horse. Fonnesbeck (1968); Hintz, personal communication (1973). Z Zebra. Hintz, personal communication (1973). PZ Przewalski's Horse. Hintz, personal communication (1973). C Capybara. Gonzalez and Parra, unpublished results. P Pig. Keys, et al. (1970) R Rabbit. Ingalls, et al. (1965); Mertens, personal communi- cation (1973); Proto (1963). Rt Rat. Keys, et al. (1970). f Rt J Rat (cecum inoculated with rumen fluid). Keys, et al. (1970). V Vole. Keys and Van Soest (1970); Keys, et al. (1970). T Tortoise. Hintz, personal communication. (1973). Curve for domestic ruminants (Goering and Van Soest, 1970). There are several possible factors that contribute to the differences noted above. A faster rate of passage for nonruminant herbivores would decrease digestion of fibrous food, and smaller nonruminant herbivores have the higher passage rates. Prins and Geelen (1971) and Short, et al. (1974) argue the same to explain the differences between large and small rumi- nants in their ability to digest fiber. The importance of retention time of the digesta for obtaining a maximum of the potential available in the fiber is brought into focus by Figure 4. Both
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