Modelling digestive constraints in non-ruminant and ruminant foregut-fermenting mammals.

  title={Modelling digestive constraints in non-ruminant and ruminant foregut-fermenting mammals.},
  author={Adam J. Munn and Wolf Juergen Streich and J{\"u}rgen Hummel and Marcus Clauss},
  journal={Comparative biochemistry and physiology. Part A, Molecular \& integrative physiology},
  volume={151 1},
  • A. MunnW. Streich M. Clauss
  • Published 1 September 2008
  • Biology, Medicine
  • Comparative biochemistry and physiology. Part A, Molecular & integrative physiology

The effect of very low food intake on digestive physiology and forage digestibility in horses.

The results suggest that below a certain food intake threshold, the major digestive constraint is not fermentation time but nutrient supply to gut bacteria, and might differ between ruminants and equids.

Digesta kinetics in gazelles in comparison to other ruminants: Evidence for taxon-specific rumen fluid throughput to adjust digesta washing to the natural diet.

  • M. DittmannJ. Hummel M. Clauss
  • Biology, Medicine
    Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
  • 2015

Feeding biology of two functionally different foregut-fermenting mammals, the marsupial red kangaroo and the ruminant sheep: how physiological ecology can inform land management.

Diet choice, apparent digestibility, food intake and grazing behaviour of Australia’s largest kangaroos, the red kangaroo Macropus rufus and the ruminant sheep Ovis aries were compared and Kangaroos were more selective in their diet, having a narrower niche compared with sheep.

Comparison of gut fill in sheep (Ovis aries) measured by intake, digestibility, and digesta retention compared with measurements at harvest

The results suggest that DMF can be estimated from measures of digestion, digestibility, and gut mean retention time (MRT) in sheep fed at different intake levels and compared results with DMF at dissection at the end of the feeding trial.

Comparative methane emission by ratites: Differences in food intake and digesta retention level out methane production.

Decreasing methane yield with increasing food intake keeps daily methane emissions constant in two foregut fermenting marsupials, the western grey kangaroo and red kangaroo

Methane emissions from kangaroos are comparable with those of other non-ruminant foregut fermenting herbivores, and may be a function of digesta processing rather than harbouring a unique low-methane producing microbial community.

Scaling at different ontogenetic stages: Gastrointestinal tract contents of a marsupial foregut fermenter, the western grey kangaroo Macropus fuliginosus melanops.



Modelling the nutritional ecology of ungulate herbivores: evolution of body size and competitive interactions

It is suggested that the upper limit to ungulate body size is determined by the ability to extract nutrients from feeding niches during the nadir of the seasonal cycle of resource quality and abundance.

Physical constraints on voluntary intake of forages by ruminants.

  • M. Allen
  • Biology, Medicine
    Journal of animal science
  • 1996
Because NDF generally ferments and passes from the reticulorumen more slowly than other dietary constituents, it has a greater filling effect over time than non-fibrous feed components and has been found to be the best single chemical predictor of VDMI.

Ingestive and Digestive Responses to Dietary Fiber and Nitrogen by 2 Macropodid Marsupials (Macropus-Robustus-Erubescens and M-R-Robustus) and a Ruminant (Capra-Hircus)

It was-concluded that the macropodids can maintain relatively greater intakes of increasingly fibrous diets if the constraint of mastication is removed by grinding and/or pelleting the feed on offer.

A Nutritional Explanation for Body-Size Patterns of Ruminant and Nonruminant Herbivores

Calculations suggest that sufficient intake of a high-fiber diet cannot be maintained to provide the energy necessary to support larger body sizes, and changing body size is postulated as a mechanism for differentiating the feeding requirements of herbivores.

Comparative nutrient extraction from forages by grazing bovids and equids: a test of the nutritional model of equid/bovid competition and coexistence

Data presented here demonstrate that compared to similarly sized grazing ruminants (bovids), hind-gut fermenters (equids) have higher rates of food intake which more than compensate for their lesser ability to digest plant material.

Forage fermentation patterns and their implications for herbivore ingesta retention times

Based on results, a longer passage time of food particles seems to be adaptive for grazing ruminants, as over a wide range of fermentation times, absolute gas production rate is higher in grass compared with dicots.

The measurement of liquid and solid digesta retention in ruminants, equines and rabbits given timothy (Phleum pratense) hay

Solids retention decreased with decreasing body-weight in the ruminants, but sheep had longer retention times than goats of similar size, and Equines exhibited large individual variation in retention of the liquid or solid markers, seemingly unrelated to size.

Characteristics of plant cell walls affecting intake and digestibility of forages by ruminants.

A simple model of cell-wall digestion and passage in which ruminal fill is a function of rates of digestion and Passage, as well as the indigestible fraction of thecell-wall indicates that cell- wall concentration and rate of passage are the most critical parameters determining ruminalFill.