| Changes in the viscoelastic behaviour of the rumenal digesta mat of sheep fed on pasture or chaffed lucerne hay. | |
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MedLine Citation:
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PMID: 19663970 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We examined the changes in the physical properties of the digesta mat over a period of 24 h after cessation of feeding, in sheep that had been maintained on pasture or fed chaffed lucerne hay. The dry matter content of the digesta mat declined at similar rates in both dietary groups, although it was generally higher in sheep fed lucerne. Median particle size declined in the digesta mats of both dietary groups at similar rates in samples taken after 8 h, but median particle size was significantly greater in sheep fed chopped lucerne hay than in those fed grass. Thus, particles were not reduced to a common size suggesting that factors in addition to particle size governed the rate of breakdown of the rumen mat. The relationship between the elastic and loss moduli was of a consistent pattern in all samples taken from the rumen mat indicating that it behaved as a weak gel. The elastic and loss moduli of the digesta mats of sheep that had been fed pasture or chopped lucerne hay converged to similar values after 12 h and declined broadly at similar rates after this. The relationship between these two moduli and the dry matter content of the rumen mat were of similar curvilinear form for sheep on both diets. These findings suggest that the rate of breakdown of the rumen mat is more likely to be governed by its composite behaviour than by the size of the constituent particles. |
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Authors:
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R G Lentle; K J Stafford; K Bekkour; P Aserevujanon; S Sylvester; Y Hemar |
Publication Detail:
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Type: Journal Article Date: 2009-08-03 |
Journal Detail:
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Title: Journal of animal physiology and animal nutrition Volume: 94 ISSN: 1439-0396 ISO Abbreviation: J Anim Physiol Anim Nutr (Berl) Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-23 Completed Date: 2010-11-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101126979 Medline TA: J Anim Physiol Anim Nutr (Berl) Country: Germany |
Other Details:
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Languages: eng Pagination: 495-504 Citation Subset: IM |
Affiliation:
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Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand. R.G.Lentle@massey.ac.nz |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed Animal Nutritional Physiological Phenomena Animals Digestion / physiology* Fasting Medicago sativa* Particle Size Poaceae* Random Allocation Rheology Rumen / chemistry*, metabolism* Sheep / metabolism* Viscosity |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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