TECHNOLOGY FOCUS - BIOLOGY - Preferred Microorganism: A mixture of microorganisms comprises (a) mixture of microorganisms comprising B.subtilis (NRRL B-50136; 1.1x 109 CFU/g) or B.subtilis (NRRL B-50136; 1.6x 109 CFU/g )or B.subtilis (NRRL B-50136; 3.5x 109 CFU/g), P.monteilii (NRRL B-50256; 0.6x 109 CFU/g) or P.monteilii (NRRL B-50258; 0.8x 109 CFU/g) or P.monteilii (NRRL B-50258; 0.8x 109 CFU/g) or P.monteilii (NRRL B-50256; 0.2x 109 CFU/g) or P.monteilii (NRRL B-50250; 0.1x 109 CFU/g), E. dissolvens (NRRL B-50257; 0.6x 109 CFU/g), or E. dissolvens (NRRL B-50257; 0.3x 109 CFU/g), P.fluorescens (ATCC 31483; 0.8x 109 CFU/g), Pseudomonas putida (NRRL B-50247; 0.4x 109) or Pseudomonas putida (NRRL B-50247; 0.2x 109 CFU/g) or Pseudomonas putida (ATCC 49451; 0.2x 109), P. plecoglossicida (NRRL B-50248; 0.4x 109 CFU/g) or P. plecoglossicida (ATCC 31483; 0.7x 109 CFU/g), or P. plecoglossicida (NRRL B-50248; 0.2x 109 CFU/g), R. pyridinivorans (NRRL 50249; 0.8x 109 CFU/g) or R. pyridinivorans (NRRL 50249; 0.3x 109 CFU/g), P.putfcfa (ATCC 49451 , 0.4x 109 CFU/g), P.mendocina (ATCC 53757; 0.8x 109 CFU/g) or P.mendocina (ATCC 53757; 0.3x 109 CFU/g), and Acinetobacter baumanii (NRRL B-50254; 0.2x 109 CFU/g), (b) a mixture of microorganisms comprising B.pumilus (NRRL B-50255; 0.2x 109 CFU/g), B.licheniformis (NRRL B-50017; 0.2x 109 CFU/g), B.amyloliquefaciens (NRRL B-50151; 0.2x 109 CFU/g), and P.antarctica (NRRL B-50259; 0.2x 109 CFU/g) Aspergillus niger (NRRL 50245; 0.8x 109 CFU/g), and Aspergillus oryzae (NRRL 50246; 0.8x 109 CFU/g) and (c) mixture of microorganisms in the commercially available products marketed under the trade names BI-CHEM (RTM: Not defined) ABR-Hydrocarbon, BI-CHEM (RTM: Not defined) DC 1008 CB and Manure Degrader.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: The amount of strain is 1.0x 106 to 5.0x 109 Colony forming unit (CFU)/g. The anaerobic fermentation for biogas production takes place after step (c) or before step (b). The material comprising lignocellulosic fibres is derived from manure that has been subjected to a biogas production process including a fractionation process providing a fraction comprising lignocellulosic fibres. EXAMPLE - No suitable example given.