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Prediction of intake and digestion in ruminants by a model of rumen kinetics integrating animal size and plant characteristics

Published online by Cambridge University Press:  27 March 2009

A. W. Illius  and
I. J. Gordon
A. W. Illius
Affiliation:
Division of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK
I. J. Gordon
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF, UK
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Summary

Simulation modelling was used to investigate interactions between forage degradation characteristics, rumen processes and body weight, and to predict the voluntary food intake and digestion of a range of forages. Predicted voluntary intake and digestion agreed well with empirical data, explaining 61 and 70%, respectively, of variance in observed values. Since the data covered a wide range of animal weights and forage qualities, these results suggest that the model is a useful means of integrating the effects of animal and forage variables. Interactions were examined between animal weight and diet quality, as defined by the proportion of potentially digestible cell contents and cell walls and their rates of digestion. Retention time of food in the digestive tract was shown by regression to scale with W0·27. The time taken to comminute large fibre particles also scaled with W0·27. Longer retention of digesta by large ruminants increases digestive efficiency compared with small animals and would permit them to survive on lower-quality foods. The model showed that maximum intake of metabolizable energy scales with c. W0·87, greater than the scaling of maintenance with W0·73.

Type
Animals
Information
The Journal of Agricultural Science , Volume 116 , Issue 1 , February 1991 , pp. 145 - 157
Copyright
Copyright © Cambridge University Press 1991

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