Retention of solutes and particles in the gastrointestinal tract of a grazing cervid: Père David’s deer (Elaphurus davidianus)
Ruminants are classified into three groups, according to their feeding behaviour: browsers, intermediate feeders and grazers. Corresponding to their dietary preferences, multiple morphological and physiological adaptations have been described, resulting in another classification: ‘moose-type’ and ‘cattle-type’ ruminants. Digesta retention patterns in the gastrointestinal tract (GIT) and reticulorumen (RR) are considered major criteria to distinguish these types, as cattle-type ruminants show shorter retention of fluids (measured by a solute marker) than of particles, while in moose-type ruminants, both are retained for more similar periods. To what extent these digestive types are specific to phylogenetic lineages is still unclear. We measured mean retention times (MRTs) of solutes and particles (2 and 20 mm) in the strictest grazing cervid: the Père David’s deer (Elaphurus davidianus; n = 5; body mass = 155.0 ± 14.5 kg). The MRTs of solutes, small and large particles in the GIT were 34 ± 4, 60 ± 7 and 69 ± 9 h, respectively. The ratio of the MRT of small particles versus solutes in the RR was 2.0 ± 0.1, similar to other cattle-type ruminants. The results confirm the hypothesis that Père David’s deer can be classified as cattle-type ruminants, corresponding to both dietary preferences and previously described morphological traits. The results complement previous findings, showing that both cattle-type and moose-type physiologies are found among bovids as well as cervids, indicating that these digestion types can be considered convergent adaptations.
KeywordsBrowser-grazer dichotomy Digestive physiology Père David’s deer Reticulorumen Selectivity factor
We thank Heidrun Barleben for the marker analyses and Herman de Rycke for the analyses on nutrition and faeces. We also thank the zookeepers of Zoo Wuppertal for support and assistance in the handling of the animals, particularly the following: Jürgen Abend, Frank Soumagne, Andrea Becker, Boris Kostka, Jörg Effenberger, Kevin Büttner, Roland Stöter and Malena Reeh. Furthermore, special thanks to veterinary nurses Laura Cyrener and Katrin Gries, and zoo curators Silja Herberg and Severin Dressen, and three reviewers for comments on the manuscript.
- AOAC (1995) Official methods of analysis of AOAC International. Association of Official Analytical Chemists, Arlington VAGoogle Scholar
- Beck B, Wemmer C (1983) The biology and management of an extinct species: Père David’s deer. Noyes Publications, ParkridgeGoogle Scholar
- Clauss M, Fritz J, Bayer D, Nygren K, Hammer S, Hatt J-M, Südekum K-H, Hummel J (2009a) Physical characteristics of rumen contents in four large ruminants of different feeding type, the addax (Addax nasomaculatus), bison (Bison bison), red deer (Cervus elaphus) and moose (Alces alces). Comp Biochem Physiol A 152:398–406CrossRefGoogle Scholar
- Dittmann MT, Hummel J, Hammer S, Arif A, Hebel C, Müller DWH, Fritz J, Steuer P, Schwarm A, Kreuzer M, Clauss M (2015a) Digesta retention in gazelles in comparison to other ruminants: evidence for taxon-specific rumen fluid throughput to adjust digesta washing to the natural diet. Comp Biochem Physiol A 185:58–68CrossRefGoogle Scholar
- Frei S, Ortmann S, Reutlinger C, Kreuzer M, Hatt J-M, Clauss M (2015) Comparative digesta retention patterns in ratites. Auk Ornithol Adv 132:119–131Google Scholar
- Hofmann RR (1985) Digestive physiology of deer - their morphophysiological specialisation and adaptation. Roy Soc N Z Bull 22:393–407Google Scholar
- Hofmann RR (1991) Endangered tropical herbivores - their nutritional requirements and habitat demands. In: Ho YW, Wong HK, Abdullah N, Tajuddin ZA (eds) Recent advances on the nutrition of herbivores. Malaysia Society of Animal Production, UPM Serdang, pp 27–34Google Scholar
- Lechner I, Barboza P, Collins W, Fritz J, Günther D, Hattendorf B, Hummel J, Südekum K-H, Clauss M (2010) Differential passage of fluids and different-sized particles in fistulated oxen (Bos primigenius f. taurus), muskoxen (Ovibos moschatus), reindeer (Rangifer tarandus) and moose (Alces alces): rumen particle size discrimination is independent from contents stratification. Comp Biochem Physiol A 155:211–222CrossRefGoogle Scholar
- Nowak RM, Paradiso JL (1999) Walker's Mammals of the world, 6th edn. The Johns Hopkins University Press, Baltimore and LondonGoogle Scholar
- Renecker LA, Hudson RJ (1990) Digestive kinetics of moose (Alces alces) , wapiti (Cervus elaphus) and cattle. Br Soc Anim Prod 50:51–61Google Scholar
- Van Wieren SE (1996) Browser and grazers: foraging strategies in ruminants. In: Van Wieren SE (ed) Digestive strategies in ruminants and nonruminants. Thesis Landbouw. University of Wageningen, Wageningen, pp 119–146Google Scholar