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Clauss, Marcus; Fritz, J; Tschuor, A; Braun, Ueli; Hummel, J; Codron, D (2017). Dry matter and digesta particle size gradients along the goat digestive tract on grass and browse diets. Journal of Animal Physiology and Animal Nutrition, 101:61-69.

Vendl, C; Clauss, Marcus; Stewart, M; Leggett, K; Hummel, J; Kreuzer, M; Munn, A (2015). Decreasing methane yield with increasing food intake keeps daily methane emissions constant in two foregut fermenting marsupials, the western grey kangaroo and red kangaroo. Journal of Experimental Biology, 218(21):3425-3434.

Müller, J; Clauss, Marcus; Codron, Daryl; Schulz, E; Hummel, J; Kircher, Patrick; Hatt, Jean-Michel (2015). Tooth length and incisal wear and growth in guinea pigs (Cavia porcellus) fed diets of different abrasiveness. Journal of Animal Physiology and Animal Nutrition, 99(3):591-604.

Clauss, Marcus; Schiele, K; Ortmann, S; Fritz, J; Codron, D; Hummel, J; Kienzle, E (2014). The effect of very low food intake on digestive physiology and forage digestibility in horses. Journal of Animal Physiology and Animal Nutrition, 98:107-118.

Taylor, L A; Rudd, J; Hummel, J; Clauss, Marcus; Schwitzer, C (2013). Weight loss in pygmy hippos (Choeropsis liberiensis). In: Steck, B. International Studbook for the Year 2012 - Pygmy Hippopotamus. Basel: Zoo Basel, 20-25.

Müller, D W H; Codron, D; Werner, J; Fritz, J; Hummel, J; Griebeler, E M; Clauss, Marcus (2012). Dichotomy of eutherian reproduction and metabolism. Oikos, 121(1):102-115.

Serrano Ferron, E; Verheyden, H; Hummel, J; Cargnelutti, B; Lourtet, B; Merlet, J; González-Candela, M; Angibault, J M; Hewison, A J M; Clauss, Marcus (2012). Digestive plasticity as a response to woodland fragmentation in roe deer. Ecological Research, 27(1):77-82.

Franz, R; Kreuzer, M; Hummel, J; Hatt, Jean-Michel; Clauss, Marcus (2011). Intake, selection, digesta retention, digestion and gut fill of two coprophageous species, rabbits (Oryctolagus cuniculus) and guinea pigs (Cavia porcellus), on a hay-only diet. Journal of Animal Physiology and Animal Nutrition, 95(5):564-570.

Clauss, Marcus; Hummel, J (2011). Comparative fibre digestion. In: 15th Congress European Society of Veterinary and Comparative Nutrition, Zaragoza, Spain, 14 September 2011 - 16 September 2011, 9-15.

Franz, R; Soliva, C R; Kreuzer, M; Hummel, J; Clauss, Marcus (2011). Methane output of rabbits (Oryctolagus cuniculus) and guinea pigs (Cavia porcellus) fed a hay-only diet: Implications for the scaling of methane production with body mass in non-ruminant mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 158(1):177-181.

Hummel, J; Findeisen, E; Südekum, K H; Ruf, I; Kaiser, T M; Bucher, M; Clauss, Marcus; Codron, D (2011). Another one bites the dust: faecal silica levels in large herbivores correlate with high-crowned teeth. Proceedings of the Royal Society B: Biological Sciences, 278(1712):1742-1747.

Sander, P M; Christian, A; Clauss, Marcus; Fechner, R; Gee, C T; Griebeler, E M; Gunga, H C; Hummel, J; Mallison, H; Perry, S F; Preuschoft, H; Rauhut, O W M; Remes, K; Tütken, T; Wings, O; Witzel, U (2011). Biology of the sauropod dinosaurs: the evolution of gigantism. Biological Reviews, 86(1):117-155.

Clauss, Marcus; Lunt, N; Ortmann, S; Plowman, A; Codron, D; Hummel, J (2011). Fluid and particle passage in three duiker species. European Journal of Wildlife Research, 57(1):143-148.

Fritz, J; Hummel, J; Kienzle, E; Wings, O; Streich, W J; Clauss, Marcus (2011). Gizzard vs. teeth, it’s a tie: food-processing efficiency in herbivorous birds and mammals and implications for dinosaur feeding strategies. Paleobiology, 37(4):577-586.

Clauss, Marcus; Hatt, Jean-Michel; Hummel, J (2011). Green grocery guide. Zooquaria, (5):22-23.

Franz, R; Hummel, J; Müller, Dennis W H; Bauert, M; Hatt, Jean-Michel; Clauss, Marcus (2011). Herbivorous reptiles and body mass: Effects on food intake, digesta retention, digestibility and gut capacity, and a comparison with mammals. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 158(1):94-101.

Steuer, P; Südekum, K H; Müller, D W H; Franz, R; Kaandorp, J; Clauss, Marcus; Hummel, J (2011). Is there an influence of body mass on digesta mean retention time in herbivores? A comparative study on ungulates. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 160(3):355-364.

Franz, R; Soliva, C R; Kreuzer, M; Hatt, Jean-Michel; Furrer, S; Hummel, J; Clauss, Marcus (2011). Methane output of tortoises: Its contribution to energy loss related to herbivore body mass. PLoS ONE, 6(3):e17628.

Müller, D W H; Caton, J; Codron, D; Schwarm, A; Lentle, R; Streich, W J; Hummel, J; Clauss, Marcus (2011). Phylogenetic constraints on digesta separation: Variation in fluid throughput in the digestive tract in mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 160(2):207-220.

Hummel, J; Clauss, Marcus (2011). Sauropod feeding and digestive physiology. In: Klein, N; Remes, K; Gee, C T; Sander, P M. Biology of the sauropod dinosaurs. Understanding the life of giants. Bloomington and Indianapolis: Indiana University Press, 11-32.

Hebel, C; Ortmann, S; Hammer, S; Hammer, C; Fritz, J; Hummel, J; Clauss, Marcus (2011). Solute and particle retention in the digestive tract of the Phillip's dikdik (Madoqua saltiana phillipsi), a very small browsing ruminant: Biological and methodological implications. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 159(3):284-290.

Clauss, Marcus; Lechner, I; Barboza, P; Collins, W; Tervoort, T A; Südekum, K H; Codron, D; Hummel, J (2011). The effect of size and density on the mean retention time of particles in the reticulorumen of cattle ( Bos primigenius f. taurus), muskoxen ( Ovibos moschatus) and moose ( Alces alces). British Journal of Nutrition, 105:634-644.

Clauss, Marcus; Lang-Deuerling, S; Müller, D W H; Kienzle, E; Steuer, P; Hummel, J (2010). Retention of fluid and particles in captive tapirs (Tapirus sp.). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 157(1):95-101.

Steuer, P; Clauss, Marcus; Südekum, K H; Hatt, Jean-Michel; Silinksi, S; Klomburg, S; Zimmermann, W; Fickel, J; Streich, W J; Hummel, J (2010). Comparative investigations on digestion in grazing (Ceratotherium simum) and browsing (Diceros bicornis) rhinoceroses. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 156(4):380-388.

Meyer, K; Hummel, J; Clauss, Marcus (2010). The relationship between forage cell wall content and voluntary food intake in mammalian herbivores. Mammal Review, 40(3):221-245.

Sander, P M; Gee, C T; Hummel, J; Clauss, Marcus (2010). Mesozoic plants and dinosaur herbivory. In: Gee, C T. Plants in Mesozoic time: Morphological innovations, phylogeny, ecosystems. Bloomington: Indiana University Press, 331-359.

Clauss, Marcus; Hofmann, R R; Streich, W J; Fickel, J; Hummel, J (2010). Convergence in the macroscopic anatomy of the reticulum in wild ruminant species of different feeding types and a new resulting hypothesis on reticular function. Journal of Zoology, 281(1):26-38.

Kaiser, T M; Fickel, J; Streich, W J; Hummel, J; Clauss, Marcus (2010). Enamel ridge alignment in upper molars of ruminants in relation to their natural diet. Journal of Zoology, 281(1):12-25.

Clauss, Marcus; Hume, I D; Hummel, J (2010). Evolutionary adaptations of ruminants and their potential relevance for modern production systems. animal, 4(7):979-992.

Lechner, I; Barboza, P; Collins, W; Fritz, J; Günther, D; Hattendorf, B; Hummel, J; Südekum, K H; Clauss, Marcus (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. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 155 A(2):211-222.

Franz, R; Soliva, C R; Kreuzer, M; Steuer, P; Hummel, J; Clauss, Marcus (2010). Methane production in relation to body mass of ruminants and equids. Evolutionary Ecology Research, 12:727-738.

Fritz, J; Hummel, J; Kienzle, E; Streich, W J; Clauss, Marcus (2010). To chew or not to chew: fecal particle size in herbivorous reptiles and mammals. Journal of Experimental Zoology. Part A: Ecological Genetics and Physiology, 313A(9):579-586.

Clauss, Marcus; Nunn, C; Fritz, J; Hummel, J (2009). Evidence for a tradeoff between retention time and chewing efficiency in large mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 154(3):376-382.

Schwarm, A; Schweigert, M; Ortmann, S; Hummel, J; Janssens, G P J; Streich, W J; Clauss, Marcus (2009). No easy solution for the fractionation of faecal nitrogen in captive wild herbivores: results of a pilot study. Journal of Animal Physiology and Animal Nutrition, 93(5):596-605.

Lechner, I; Barboza, P; Collins, W; Günther, D; Hattendorf, B; Hummel, J; Clauss, Marcus (2009). No ‘bypass’ in adult ruminants: Passage of fluid ingested vs. fluid inserted into the rumen in fistulated muskoxen (Ovibos moschatus), reindeer (Rangifer tarandus) and moose (Alces alces). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 154(1):151-156.

Clauss, Marcus; Hofmann, R R; Fickel, J; Streich, W J; Hummel, J (2009). The intraruminal papillation gradient in wild ruminants of different feeding types: implications for rumen physiology. Journal of Morphology, 270(8):929-942.

Franz, R; Hummel, J; Kienzle, E; Kölle, P; Gunga, H C; Clauss, Marcus (2009). Allometry of visceral organs in living amniotes and its implications for sauropod dinosaurs. Proceedings of the Royal Society B: Biological Sciences, 276(1662):1731-1736.

Fritz, J; Hummel, J; Kienzle, E; Arnold, Christian; Nunn, C; Clauss, Marcus (2009). Comparative chewing efficiency in mammalian herbivores. Oikos, 118:1623-1632.

Colville, K; Bouts, T; Hartley, A; Clauss, Marcus; Routh, A (2009). Frothy bloat and serous fat atrophy associated with insufficient fibre intake in a giraffe (Giraffa camelopardalis). In: Clauss, Marcus; Fidgett, A; Hatt, Jean-Michel; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 219-229.

Clauss, Marcus; Reese, S; Eulenberger, K (2009). Macroscopic digestive anatomy of a captive lowland anoa (Bubalus depressicornis). In: Clauss, Marcus; Fidgett, A; Hatt, Jean-Michel; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 255-263.

Clauss, Marcus; Lang-Deuerling, S; Kienzle, E; Medici, E P; Hummel, J (2009). Mineral absorption in tapirs (Tapirusspp.) as compared to the domestic horse. Journal of Animal Physiology and Animal Nutrition, 93(6):768-776.

Zenker, W; Clauss, Marcus; Huber, J; Altenbrunner-Martinek, B (2009). Rumen pH and hoof health in two groups of captive wild ruminants. In: Clauss, Marcus; Fidgett, A; Hatt, Jean-Michel; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 247-254.

Zoo Animal Nutrition IV. Edited by: Clauss, Marcus; Fidgett, A; Janssens, G; Hatt, Jean-Michel; Huisman, T; Hummel, J; Nijboer, J; Plowman, A (2009). Fuerth, Germany: Filander.

Clauss, Marcus; Hummel, J (2008). Getting it out of the (digestive) system : hindgut fermenters and calcium. In: 7th Biennial Symposium of the Comparative Nutrition Society, Liscomb Mills, Nova Scotia , 8 August 2008 - 13 August 2008, 30-36.

Clauss, Marcus; Streich, W J; Nunn, C L; Ortmann, S; Hohmann, G; Schwarm, A; Hummel, J (2008). The influence of natural diet composition, food intake level, and body size on ingesta passage in primates. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 150(3):274-281.

Clauss, Marcus; Hummel, J; Schwarm, A; Steuer, P; Fritz, J; Martin Jurado, Olga; Tschudin, A; Hatt, Jean-Michel (2008). An isthmus at the caecocolical junction is an anatomical feature of domestic and wild equids. European Journal of Wildlife Research, 54(2):347-351.

Hofmann, R R; Streich, W J; Fickel, J; Hummel, J; Clauss, Marcus (2008). Convergent evolution in feeding types: salivary gland mass differences in wild ruminant species. Journal of Morphology, 269(2):240-257.

Hummel, J; Fritz, J; Kienzle, E; Medici, E P; Lang, S; Zimmermann, W; Streich, W J; Clauss, Marcus (2008). Differences in fecal particle size between free-ranging and captive individuals of two browser species. Zoo Biology, 27(1):70-77.

Hummel, J; Steuer, P; Südekum, K H; Hammer, S; Hammer, C; Streich, W J; Clauss, Marcus (2008). Fluid and particle retention in the digestive tract of the addax antelope (Addax nasomaculatus)--adaptations of a grazing desert ruminant. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 149(2):142-149.

Clauss, Marcus; Hofmann, R R; Streich, W J; Fickel, J; Hummel, J (2008). Higher masseter muscle mass in grazing than in browsing ruminants. Oecologia, 157(3):377-385.

Hummel, J; Gee, C T; Südekum, K H; Sander, P M; Nogge, G; Clauss, Marcus (2008). In vitro digestibility of fern and gymnosperm foliage: implications for sauropod feeding ecology and diet selection. Proceedings of the Royal Society B: Biological Sciences, 275(1638):1015-1021.

Clauss, Marcus; Hummel, J; Streich, W J; Südekum, K H (2008). Mammalian metabolic rate scaling to 2/3 or 3/4 depends on the presence of gut contents. Evolutionary Ecology Research, 10:153-154.

Hummel, J; Clauss, Marcus (2008). Megaherbivores as pacemakers of carnivore diversity and biomass: distributing or sinking trophic energy. Evolutionary Ecology Research, 10:925-930.

Munn, A J; Streich, W J; Hummel, J; Clauss, Marcus (2008). Modelling digestive constraints in non-ruminant and ruminant foregut-fermenting mammals. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 151(1):78-84.

Clauss, Marcus; Wittenbrink, M M; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Macgregor, S K; Hoppe, T; Hummel, J; Streich, W J; Hatt, Jean-Michel (2008). Quantification of Enterobacteriaceae in faeces of captive black rhinoceros (Diceros bicornis) in relation to dietary tannin supplementation. Journal of Animal Physiology and Animal Nutrition, 92(1):29-34.

Clauss, Marcus; Kaiser, T; Hummel, J (2008). The morphophysiological adaptations of browsing and grazing mammals. In: Gordon, I J; et al. The ecology of browsing and grazing. Berlin: Springer, 47-88.

Clauss, Marcus; Schwarm, A; Ortmann, S; Streich, W J; Hummel, J (2007). A case of non-scaling in mammalian physiology? Body size, digestive capacity, food intake, and ingesta passage in mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 148(2):249-265.

Clauss, Marcus; Castell, J C; Kienzle, E; Schramel, P; Dierenfeld, E S; Flach, E J; Behlert, O; Streich, W J; Hummel, J; Hatt, Jean-Michel (2007). Mineral absorption in the black rhinoceros (Diceros bicornis) as compared with the domestic horse. Journal of Animal Physiology and Animal Nutrition, 91(5-6):193-204.

Clauss, Marcus; Steinmetz, H W; Eulenberger, Ulrike; Ossent, Pete; Zingg, R; Hummel, J; Hatt, Jean-Michel (2007). Observations on the length of the intestinal tract of African Loxodonta africana (Blumenbach 1797) and Asian elephants Elephas maximus (Linne 1735). European Journal of Wildlife Research, 53(1):68-72.

Clauss, Marcus; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Behlert, O; Ortmann, S; Streich, W J; Hummel, J; Hatt, Jean-Michel (2007). The influence of dietary tannin supplementation on digestive performance in captive black rhinoceros (Diceros bicornis). Journal of Animal Physiology and Animal Nutrition, 91(11-12):449-458.

Clauss, Marcus; Streich, W J; Schwarm, A; Ortmann, S; Hummel, J (2007). The relationship of food intake and ingesta passage predicts feeding ecology in two different megaherbivore groups. Oikos, 116(2):209-216.

Clauss, Marcus; Hatt, Jean-Michel; Hummel, J (2006). Fütterung grosser Pflanzenfresser. In: Arbeitstagung der Zootierärzte im deutschsprachigen Raum, Frankfurt, 3 November 2006 - 5 November 2006.

Rose, P; Hummel, J; Clauss, Marcus (2006). Food and calculated energy intake in captive giraffe (Giraffa camelopardalis) in the UK. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 289.

Hummel, J; Zimmermann, W; Langenhorst, T; Schleussner, G; Damen, M; Clauss, Marcus (2006). Giraffe husbandry and feeding practices in Europe. Results of an EEP survey. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 71-74.

Clauss, Marcus; Rose, P; Hummel, J; Hatt, Jean-Michel (2006). Serous fat atrophy and other nutrition-related health problems in captive giraffe (Giraffa camelopardalis). An evaluation of 83 necropsy reports. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 233-235.

Clauss, Marcus; Pellegrini, N; Castell, J C; Kienzle, E; Dierenfeld, E S; Hummel, J; Flach, E J; Streich, W J; Hatt, Jean-Michel (2006). Antioxidant status of faeces of captive black rhinoceros (Diceros bicornis) in relation to dietary tannin supplementation. Journal of Veterinary Medicine Series A, 53(6):319-322.

Höllerl, S; Stimm, B; Hummel, J; Clauss, Marcus (2006). Browse provision for captive herbivores. Design and management of a browse plantation. In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 211-212.

Clauss, Marcus; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Behlert, O; Ortmann, S; Streich, W J; Hummel, J; Hatt, Jean-Michel (2006). Digestion coefficients achieved by the black rhinoceros (Diceros bicornis), a large browsing hindgut fermenter. Journal of Animal Physiology and Animal Nutrition, 90(7-8):325-334.

Schwarm, A; Ortmann, S; Hofer, H; Streich, W J; Flach, E J; Kühne, R; Hummel, J; Castell, J C; Clauss, Marcus (2006). Digestion studies in captive Hippopotamidae: a group of large ungulates with an unusually low metabolic rate. Journal of Animal Physiology and Animal Nutrition, 90(7-8):300-308.

Hummel, J; Nogge, G; Clauss, Marcus; Nørgard, C; Johanson, K; Nijboer, J; Pfeffer, E (2006). Energy supply of the okapi in captivity: fermentation characteristics of feedstuffs. Zoo Biology, 25(4):251-266.

Hummel, J; Pfeffer, E; Nørgard, C; Johanson, K; Clauss, Marcus; Nogge, G (2006). Energy supply of the okapi in captivity: intake and digestion trials. Zoo Biology, 25(4):303-316.

Clauss, Marcus; Hänichen, T; Hummel, J; Ricker, U; Block, K; Grest, Paula; Hatt, Jean-Michel (2006). Excessive iron storage in captive omnivores? The case of the coati (Nasua spp.). In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 91-99.

Hummel, J; Clauss, Marcus (2006). Feeding. In: Barta, Z; Clauss, M; Culik, L; Damen, M; Hummel, J; Schleussner, G; Tomasova, K; Zimmermann, W. EAZA Husbandry and Management Guidelines for Giraffa camelopardalis. Arnhem: Burger's Zoo, 29-61.

Hummel, J; Südekum, K H; Streich, W J; Clauss, Marcus (2006). Forage fermentation patterns and their implications for herbivore ingesta retention times. Functional Ecology, 20(6):989-1002.

Clauss, Marcus; Hofmann, R R; Hummel, J; Adamczewski, J; Nygren, K; Pitra, C; Streich, W J; Reese, S (2006). Macroscopic anatomy of the omasum of free-ranging moose (Alces alces) and muskoxen (Ovibos moschatus) and a comparison of the omasal laminal surface area in 34 ruminant species. Journal of Zoology, 270(2):346-358.

Clauss, Marcus; Hummel, J; Eloff, P; Willats, R (2006). Sources of high iron content in manufactured pelleted feeds: a case report. In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 101-102.

Clauss, Marcus; Hummel, J; Völlm, J; Lorenz, A; Hofmann, R R (2006). The allocation of a ruminant feeding type to the okapi (Okapia johnstoni) on the basis of morphological parameters. In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 253-270.

Clauss, Marcus; Hummel, J; Streich, W J (2006). The dissociation of the fluid and particle phase in the forestomach as a physiological characteristic of large grazing ruminants: an evaluation of available, comparable ruminant passage data. European Journal of Wildlife Research, 52(2):88-98.

Hummel, J; Clauss, Marcus; Baxter, E; Flach, E J; Johanson, K (2006). The influence of roughage intake on the occurrence of oral disturbances in captive giraffids. In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 235-252.

Clauss, Marcus; Hummel, J (2006). The next meal is today: feeding recommendations in the absence of scientifically sound results – the question of iron availability. In: Fidgett, Andrea; Clauss, Marcus; Eulenberger, Klaus; Hatt, Jean-Michel; Hume, Ian; Janssens, Geert Paul Jules; Nijboer, Joeke. Zoo animal nutrition Vol. III. Fürth: Filander, 103-106.

Clauss, Marcus; Hummel, J (2005). Bemerkungen zur Ernährung von Zootieren: Mischfutterhersteller können wirksam Unterstützung leisten. Kraftfutter, (12):12-17.

Hatt, Jean-Michel; Schaub, D; Wanner, M; Wettstein, H R; Flach, E J; Tack, C; Hässig, Michael; Ortmann, S; Hummel, J; Clauss, Marcus (2005). Energy and fibre intake in a group of captive giraffe (Giraffa camelopardalis) offered increasing amounts of browse. Journal of Veterinary Medicine Series A, 52(10):485-490.

Hummel, J; Clauss, Marcus; Zimmermann, W; Johanson, K; Nørgaard, C; Pfeffer, E (2005). Fluid and particle retention in captive okapi (Okapia johnstoni). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 140(4):436-444.

Clauss, Marcus; Hummel, J; Vercammen, F; Streich, W J (2005). Observations on the macroscopic digestive anatomy of the Himalayan tahr (Hemitragus jemlahicus). Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C, 34(4):276-278.

Clauss, Marcus; Robert, N; Walzer, C; Vitaud, C; Hummel, J (2005). Testing predictions on body mass and gut contents: dissection of an African elephant Loxodonta africana Blumenbach 1797. European Journal of Wildlife Research, 51(4):291-294.

Clauss, Marcus; Hummel, J (2005). The digestive performance of mammalian herbivores: why big may not be that much better. Mammal Review, 35(2):174-187.

Clauss, Marcus; Schwarm, A; Ortmann, S; Alber, D; Flach, E J; Kühne, R; Hummel, J; Streich, W J; Hofer, H (2004). Intake, ingesta retention, particle size distribution and digestibility in the hippopotamidae. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 139(4):449-459.

This list was generated on Fri Nov 24 00:25:23 2017 CET.