Abstract: 【Objective & method】The focused effects of bio-treatments on desilicification and delignification for improving rice straw degradability were studied by comparing two bio-products of AgroGreen? (AG) and Yeast Extract? (YE), two microbial pre-culture of Agaricus blazei (A.b) and Volvariella volvacea (V.v). 【Results】Results showed that AG and YE were proved no effect on desilicification. The concentration of AG used indicated an inhibition to the growing of rumen microorganisms. However, YE enhanced straw degradability (P<0.05) by pre-treatment but lowed the degradation of straw by directly adding to nurturing ruminal microbe. By pre-culture of A.b and V.v, this increased Si-extractability by about 54.8% and 58.9%, reduced total phenolic components by about 86.4% and 79.7%, respectively. Among phenolic monomers, the proportion of flavonol was increased from 49% to 73% and 80%, but the proportion of rest was reduced from 39% to 18% and 12% for benzoic acids, and from 12% to 9% and 8% for hydroxycinnamic acids, respectively. 【Conclusion】AG and YE were proved no effect on desilicification, and the pre-culture of A.b and V.v had improved the degradation quality of treated rice straw.

Key words: Desilicification, Si-lignification compounds, Lignin degradation, Rice straw, Bio-culture