. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Table 1.—Volatile fatty acids (VFA) in the stomach of colobid monkeys and ruminants. Molecular proportions Concn mM/ Pro- n-Bu- i-Bu- n-Va- i- Va- Animal VFA Acetic pionic tyric tyric leric leric Presbytis cristatus 165 51 24 6 5 7 8 Presbytis entellus 103 50 28 14 - 5 4 Procolobus verus 181 - - Procolobus 219 - - Cattle 137 -
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975. Folivores; Forest ecology; Leaves; Mammals; Mammals. Table 1.—Volatile fatty acids (VFA) in the stomach of colobid monkeys and ruminants. Molecular proportions Concn mM/ Pro- n-Bu- i-Bu- n-Va- i- Va- Animal VFA Acetic pionic tyric tyric leric leric Presbytis cristatus 165 51 24 6 5 7 8 Presbytis entellus 103 50 28 14 - 5 4 Procolobus verus 181 - - Procolobus 219 - - Cattle 137 - - Sheep 94 58 29 7 2 1 1 3 1968). As in the rumen, the methane-producing bac- terium Methano bacterium ruminantium was shown to be present in the langur stomach (Bauchop and Martucci, 1968). Fermentation studies (Kuhn, 1964; Bauchop and Martucci, 1968) revealed rate of fermentation very similar to those obtained with small ruminants (Hungate, et al., 1959). Samples of gastric contents from colobus monkeys (Drawert, et al., 1962; Ohwakietal., 1974) andlangurs (Bauchop and Martucci, 1968) contained volatile fatty acids (VFA's) similar in concentration and proportions to those formed in rumen contents (Table 1). In ruminants the VFA's are absorbed directly from the rumen, and in ruminantlike animals, from the stomach (Moir, 1968). Although this has not been demonstrated directly in the Colobinae, Drawert, et al. (1962) found in Procolobus verus that the VFA concentration of the contents decreased from 230 mmoles/liter in the midstomach region to 24 mmoles/ liter in the pyloric region, indicating clearly that fatty acids are absorbed directly from the stomach. The gastric concentrations of these acids represent an equilibrium between their rate of production and their absorption from the upper stomach. A constant VFA concentration was demonstrated by analyzation of gastric samples taken from a specimen of Presbytis cristatus (Bauchop and Martucci, 1968). After feed- ing fresh al
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