. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 1. Stomach of Presbytis cristatus. PS, presaccus; S, saccus; T, tubular portion; P, thick-walled pyloric region; E, esophagus, closed by forceps. The essential features of the Colobinae stomach is that this anatomical complexity permits excellent separation of the ingesta in the proximal regions from the distal acid pyloric region (Bauchop, 1971). The pH is thus normally maintained at a value between and in the langu
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 1. Stomach of Presbytis cristatus. PS, presaccus; S, saccus; T, tubular portion; P, thick-walled pyloric region; E, esophagus, closed by forceps. The essential features of the Colobinae stomach is that this anatomical complexity permits excellent separation of the ingesta in the proximal regions from the distal acid pyloric region (Bauchop, 1971). The pH is thus normally maintained at a value between and in the langurs examined (Bauchop and Martucci, 1968) and from to around in the colobus monkeys (Kuhn, 1964; Ohwaki, et al., 1974), indicating excellent control of pH. The salivary glands are relatively extensive (Hill, 1952), and saliva may play a role as a buffer source. This range of pH values permits an active fermentation of ingesta by the large numbers of anaerobic bacteria present. As in rumi- nants, gastric contents constitute a large proportion of the body weight of these monkeys. In colobus mon- keys values obtained for gastric contents were to percent of the total body weight (Kuhn, 1964; Ohwaki, et al., 1974) and a value of 17 percent of body weight was obtained for gastric contents of a langur monkey (Bauchop and Martucci, 1968). The large capacity of the stomach allows the accumula- tion of ingesta and slow rate of passage essential for extensive fermentation of plant materials. In direct smears of stomach contents obtained from colobus monkeys, Kuhn (1964) found bacteria to be present although he did not consider that they com- pared either numerically or in diversity with ruminant flora. Characteristic ciliate protozoan fauna were absent. Samples obtained from 2 specimens of Colobus polykomos in the wild (Ohwaki, et al., 1974) also contained high numbers of bacteria and no ciliate protozoa. However, the stomach contents of these animals contained no leafy m
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Keywords: ., bookcentury1900, bookcolle, booksubjectleaves, booksubjectmammals
