Abstract # 2907 Poster # 41:

Scheduled for Thursday, June 17, 2010 07:00 PM-09:00 PM: Session 11 (Medallion Ballroom C/D/E/F) Poster Presentation


THE MYSTERY OF HINDGUT FERMENTATION IN THEROPITHECUS GELADA: RESOLVED?

M. Mau1, A. Johann2, A. Sliwa3, J. Hummel1 and K. H. Südekum1
1Institute of Animal Science, University of Bonn, Endenicher Allee 15, Bonn 53115, Germany, 2Naturzoo Rheine Salinenstr. 150, Rheine, 48432, Germany, 3Kölner Zoo AG, Riehler Str. 173, Cologne, 50735, Germany
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Hindgut fermentation has been suggested as contributing significantly to the digestion process of geladas (Theropithecus gelada). We therefore hypothesized that in an in vitro fermentation test (Hohenheim Gas Test, using gas production as measure of microbial digestion) inoculum based on fresh gelada feces would degrade grass to a similar degree as inoculum from zebras (Equus chapmani) and to a higher degree than that of hamadryas baboons (Papio hamadryas). Gas production as related to 200 mg dry matter of sample was measured at time intervals between 4 – 96 h. There were significant differences between the LSMeans of gas amounts in the three species [ANOVA: α=0.05]. For grass hay, 12-h gas production was as follows: T. gelada [19.9 ml] > Papio [18.4 ml] > Equus [15.7 ml]. After 24 h gas production changed: Papio [35.1 ml] >T. gelada [31.9 ml] >Equus [27.9 ml]. With a concentrate standard, 12-h gas production was T. gelada [38.5 ml] >Equus [36.8 ml] ≈Papio [36.4 ml]. At 24 h gas production was different: Papio [51.7 ml] >Equus [47.0 ml] ≈T. gelada [46.8 ml]. Conclusively, the results show that the microbial population of the gelada hindgut is able to ferment forage and concentrate substrates in vitro, although this did not occur with the expected effectiveness. Future studies should focus on the bacteria species involved. Support: DFG  SU124/15-1.