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Effect of Dilute-Acid-Hydrolysis Treatments on the Utilization of Wheat Straw by Rumen Bacteria and Free Enzymes

Published online by Cambridge University Press:  24 November 2017

F.B. de Castro ,
P.M. Hotten  and
E.R. Ørskov
F.B. de Castro
Affiliation:
The Rowett Research Institute, Greenburn Rd., Aberdeen AB2 9SB
P.M. Hotten
Affiliation:
The Rowett Research Institute, Greenburn Rd., Aberdeen AB2 9SB
E.R. Ørskov
Affiliation:
The Rowett Research Institute, Greenburn Rd., Aberdeen AB2 9SB
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Extract

Extensive hydrolysis of cell wall polysaccharides by rumen bacteria or free enzymes has been reported when lignocellulosic materials had been treated with steam and pressure (Dekker & Wallis, 1983; Castro & Machado, 1989). This has mainly been explained by complete hydrolysis of hemicellulose, lignin depolymerization and redistribution within the cell wall and increasing accessible pore volume by swelling of the cell walls. Physical treatment based on use of steam and pressure alone (auto-hydrolysis) is always associated with the release of toxic levels of furfural and phenolic monomers. These chemicals are able to inhibit the activity of rumen microorganisms, yeasts and free enzymes. To overcome this effect, dilute-acid-hydrolysis at low temperatures and pressures has been proposed (Grohmann et al., 1985). The aim of this study was to evaluate the effect of temperature, sulphuric acid concentration and reaction time on the utilization of treated wheat straw by dilute-acid-hydrolysis, either by rumen bacteria and free enzymes.

Type
Rumen Metabolism
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 212
Copyright
Copyright © The British Society of Animal Production 1992

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References

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