Abstract
Analyses of wheat straws indicated that CWC, ADF, hemicellulose, lignin and silica were solubilised ( P < 0·01) by NaOH treatment. However, cellulose showed resistance to solubilisation at lower levels of alkali but not at higher levels (above 7%, w/w). The ash content increased ( P < 0·01) with increasing concentrations of NaOH. The IVDMD and digestibilities of different structural polysaccharides were higher ( P < 0·01) in NaOH-treated straw than in native straw. The coefficient of correlation for cell contents with IVDMD was positive and highly significant ( P < 0·01), whereas CWC, ADF, hemicellulose, lignin, L/ADF and L/C were negatively ( P < 0·01) correlated with IVDMD and the r 2 values were 0·94, 0·94, 0·77, 0·96, 0·54, 0·81, 0·72 and 0·72, respectively. In another experiment the steam pressure treatment of wheat straw reduced ( P < 0·01) the CWC, hemicellulose, silica and ash contents while ADF, cellulose and lignin contents increased. The values for IVDMD and IVHCD of treated straw increased ( P < 0·01), whereas IVCWD, IVADFD and IVCD showed a declining trend ( P < 0·01) compared to untreated straw. The coefficient of correlation for cell contents with IVDMD was positive ( P < 0·01), whereas CWC and silica were found to be negatively ( P < 0·01) correlated with IVDMD.
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