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Degradation rate and chemical composition of different types of alkali‐treated straws during rumen digestion
Author(s) -
Lindberg J. Eric,
Ternrud Ingrid E.,
Theander Olof
Publication year - 1984
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740350505
Subject(s) - rumen , lignin , chemistry , sodium hydroxide , cellulose , straw , food science , incubation , dry matter , composition (language) , agronomy , biochemistry , organic chemistry , fermentation , biology , inorganic chemistry , linguistics , philosophy
The degradation in the rumen and change in chemical composition of untreated and four samples of alkali‐treated barley straw were studied in farm‐scale treatments with ammonia, ‘dry’ sodium hydroxide and two different aqueous sodium hydroxide systems. The alkali treatments increased the fraction soluble in organic solvents and decreased the lignin content (determined as Klason lignin). The amounts of cellulose and arabinoxylans were not significantly changed. The degree of rumen degradability increased with the order of alkaline treatment given above. The degradation rates of dry matter and the NDF fraction were parallel to each other but varied considerably with the treatments. The two most efficient aqueous alkaline treatments showed a degradation rate four times that of untreated straw. For these two samples the arabinoxylans were solubilised faster than cellulose during the first part of the incubation. In the other samples the degradation of arabinoxylans and cellulose ran almost parallel. During the rumen incubation the lignin content of the straw residues increased for all samples. There was an inverse relationship between the content of p ‐coumaric and ferulic acids on the degree of digestibility. A relationship between acetyl groups and digestibility was not found.