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The flow of forage particles and solutes through segments of the digestive tracts of cattle*

Published online by Cambridge University Press:  09 March 2007

M. J. Wylie ,
W. C. Ellis ,
J. H. Matis ,
E. M. Bailey ,
W. D. James  and
D. E. Beever
M. J. Wylie
Affiliation:
Department of Animal Science
W. C. Ellis*
Affiliation:
Department of Statistics
J. H. Matis
Affiliation:
Department of Statistics
E. M. Bailey
Affiliation:
Department of Veterinary Physiology and Pharmacology
W. D. James
Affiliation:
Center for Chemical Characterization and Analysis, Chemistry Department, Texas A & M University, College Station, Texas 77843USA
D. E. Beever
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AT, UK
*
†Corresponding author: Dr W. C. Ellis, fax +1 409 845 5292, email [email protected]
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Abstract

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An experiment was conducted to investigate the compartmental mean residence time, (CMRT) of feed residues in segments of gastrointestinal digesta of mature Holstein steers. The objective was to evaluate assumptions that feed residues flow through ruminal digesta as sequential mixing pools having age-dependent (GN) and age-independent (G1) distributed residence times respectively (GN → G1 flow). The basal diet was a semi-tropical hay containing 98 g crude protein and 503 g apparently digestible DM per kg DM. The hay was consumed and feed residues of different size and/or previous digestion from the hay were inserted into the reticulo-rumen (rumen) and abomasum. Marker profiles appearing at the duodenum and faeces were fitted to various compartment models to estimate CMRT. Post-abomasal CMRT did not differ among solutes or feed residues of different size and previous digestion and constituted only 5·8 % of the CMRT for the entire gastrointestinal tract. Markers initially applied to orally or ruminally dosed feed residues exhibited profiles in duodenal digesta and faeces conforming to GN → G1 flow. Previously undigested, masticated feed residues inserted into the dorsal rumen digesta had longer ruminal CMRT in the GN pool but not the G1 pool than did similarly inserted faecal small particles or normally ingested hay. These results support model assumptions of GN → G1 flow within rumen digesta. The results support mechanisms proposed for the GN pool as the ‘lag-rumination pool’ and the G1 pool as the ‘mass action turnover pool’. If further validated, rumen CMRT in cattle could be estimated from marker profiles in more easily obtained faeces to estimate ruminal CMRT required for feed evaluation systems.

Keywords

Compartmental modelsDigesta flowForage particle size
Type
Research Article
Information
British Journal of Nutrition , Volume 83 , Issue 3 , March 2000 , pp. 295 - 306
Copyright
Copyright © The Nutrition Society 2000

Footnotes

*

Approved for publication as TA 23227 by the Director of the Texas Agricultural Experiment Station.

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