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Australian Journal of Zoology Australian Journal of Zoology Society
Evolutionary, molecular and comparative zoology
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RESEARCH ARTICLE
Contents Vol 55(6)

Changes in the physical properties of stomach digesta during fasting in tammar wallabies (Macropus eugenii eugenii)

R. G. Lentle A B E , K. J. Stafford C , Y. Hemar D , P. Aseruvujanon A , D. J. Mellor A B and P. J. Moughan B
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A Institute of Food Nutrition and Human Health, Massey University, Private Bag 11222, Palmerston North, New Zealand.

B Riddet Centre, Massey University, Private Bag 11222, Palmerston North, New Zealand.

C Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.

D Institute of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.

E Corresponding author. Email: r.g.lentle@massey.ac.nz

Australian Journal of Zoology 55(6) 383-389 https://doi.org/10.1071/ZO07055
Submitted: 11 October 2007  Accepted: 25 May 2008   Published: 13 June 2007

Abstract

We compared changes in the particle size profiles, permeability and elastic shear modulus of digesta in the forestomach and rumen of fasting tammar wallabies (Macropus eugenii eugenii) and fistulated sheep respectively that had been fed chopped lucerne hay. The wet mass of digesta in the tammar wallaby stomach declined curvilinearly over 24 h. The relative proportion of particles >2 mm in size in tammar wallaby digesta increased significantly and that of particles <2 mm in size decreased significantly after 12 h of fasting. This contrasted with the sheep rumen digesta, in which the relative proportions of coarse and fine particles did not change significantly over time. The permeability of wallaby digesta increased significantly after 24 h whilst that of sheep declined. All samples of tammar digesta had a significant elastic component (G′) that was preserved throughout the period of fasting. Interaction between component particles was significant at all times, digesta behaving as a weak gel. The ratio of energy lost to energy stored during flow of digesta tended to decrease during the period of fasting, indicating an increase in behaviour as an elastic solid. The relationship between G′ and dry matter content and mean particle size indicated that these phenomena resulted from progressive loss of finer digesta particles and that digestion in the wallaby stomach, via permeation of the particulate by the fluid phase, was possible for up to 33 h after eating.


References

Barboza, P. S. , and Hume, I. D. (2006). Physiology of intermittent feeding: integrating responses of vertebrates to nutritional deficit and excess. Physiological and Biochemical Zoology 79, 250–264.
| Crossref | GoogleScholarGoogle Scholar | Dellow D. W. (1979). Physiology of digestion in the macropodine marsupials. Ph.D. Thesis, University of New England, Armidale.

Dellow, D. W. (1982). Studies on the nutrition of macropodine marsupials. III. The flow of digesta through the stomach and intestine of macropodines and sheep. Australian Journal of Zoology 30, 751–765.
| Crossref | GoogleScholarGoogle Scholar | Doi M. , and Edwards S. F. (1986). ‘The Theory of Polymer Dynamics.’ (Oxford University Press: Oxford.)

Faichney, G. L. (1975). The effect of formaldehyde treatment of a concentrate diet on the passage of solute and particle markers through the gastrointestinal tract of the sheep. Australian Journal of Agricultural Research 26, 319–327.
| Crossref | GoogleScholarGoogle Scholar | Faichney C. J. (1986). The kinetics of particulate matter in the rumen. In ‘Control of Digestion and Metabolism in Ruminants’. (Eds L. P. Milligan, W. L. Grovum and A. Dobson.) pp. 173–195. (Reston: Englewood Cliffs, NJ.)

Ferry J. D. (1980). ‘Viscoelastic Properties of Polymers.’ (Wiley: New York.)

Freudenberger, D. O. (1992). Gut capacity, functional allocation of gut volume and size distributions of digesta particles in two macropodid marsupials (Macropus robustus robustus and M. r. erubescens) and the feral goat (Capra hircus). Australian Journal of Zoology 40, 551–561.
| Crossref | GoogleScholarGoogle Scholar | Hollis C. J. (1984). The ability of two macropods (Macropus eugenii and M. robustus robustus) of different body size to utilize diets of differentfibre content compared with sheep. Unpublished thesis, University ofNew England, Armidale.

Hume I. D. (1999). ‘Marsupial Nutrition.’ (Cambridge University Press: Cambridge.)

Hume I. D. , and Warner A. C. I. (1980). Evolution of microbial digestion in mammals. In ‘Digestive Physiology and Metabolism in Ruminants’. (Eds Y. Rucklebusch and Y. Thivend.) pp. 665–684. (MTP Press: Lancaster.)

Ikeda, S. , and Nishinari, K. (2001). “Weak-gel”-type rheological properties of aqueous dispersions of non-aggregated κ-carrageenan helices. Journal of Agricultural and Food Chemistry 49, 4436–4441.
| Crossref | GoogleScholarGoogle Scholar | Langer P. J. (1988). ‘The Mammalian Herbivore Stomach.’ (Fischer: Stuttgart.)

Lapasin R. , and Pricl S. (1995). ‘Rheology of Industrial Polysaccharides; Theory and Applications.’ (Blackie Academic: London.)

Lentle, R. G. , Stafford, K. J. , Kennedy, M. S. , and Haslett, S. J. (2002). Rheological properties of digesta suggest little radial or axial mixing in the forestomach of the tammmar (Macropus eugenii) and the parma (Macropus parma) wallaby. Physiological Zoology 75, 572–582.
Steffe J. F. (1996). ‘Rheological Methods in Process Engineering.’ (Freeman Press: East Lansing.)

Stevens C. E. , and Hume I. D. (1995). ‘Comparative Physiology of the Vertebrate Digestive System.’ (Cambridge University Press: Cambridge.)

Waghorn, G. C. (1986). Changes in rumen digesta of cows during a restricted feeding period when offered fresh red clover, lucerne or lucerne hay. New Zealand Journal of Agricultural Research 29, 223–241.


Wilson, J. R. , and Kennedy, P. M. (1996). Plant and animal constraints to voluntary food intake associated with fibre characteristics and particle breakdown and passage in ruminants. Australian Journal of Agricultural Science 47, 199–225.


Zhou, Z. , Scales, P. J. , and Boger, D. V. (2001). Chemical and physical control of the rheology of concentrated metal oxide suspensions. Chemical Engineering Science 56, 2901–2920.
| Crossref | GoogleScholarGoogle Scholar |