الفهرس 
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Abstract
This study investigated the effect of bacteria inoculants, 5% molasses addition and ensiling periods on silage quality characteristics, chemical composition and In vitro gas production of green rice straw silage. Fresh green rice straw of Sakha 101 variety treated for silage making with Lactobacillus sp. (lactic acid bacteria, LAB) and Cellulomonas sp. (cellulolytic bacteria, CB) as follows, 1) Control, without bacterial inoculants.2) Lactic acid bacteria (LAB1) at 108 cfu/g. 3) Lactic acid bacteria (LAB2) at 106 cfu/g. 4) Cellulolytic bacteria (CB1) at 108 cfu/g.5) Cellulolytic bacteria (CB2) at 106 cfu/g. 6) LAB1 + CB1 at 108 cfu/g per type of bacteria. 7) LAB2 + CB2 at 106 cfu/g per type of bacteria. The different treatments were supplemented with or without 5% molasses and ensiled for 30, 45 or 60 days. Results were concluded that, the mixture of LAB1+CB1 with molasses addition and ensiled for 60 days revealed significantly (P<0.05) the highest lactic acid and TVFA’s concentrations and the percentages of lactic, acetic and propionic acids and the lowest pH value and NH3-Nconcentration and the percentages of isobutyric and butyric acids. Chemical composition of the different silage treatments showed that CP, EE and NFE were increased significantly (P<0.05), while CF content decreased significantly (P<0.05) with bacterial inoculants. The LAB+CB treatment with molasses and ensiled for 60 days showed significantly (P<0.05) the highest CP, EE, NFE and non structure carbohydrates (NSC) and the lowest CF, NDF, ADF, ADL, cellulose, hemicellulose and lignin, however, the control treatment had the opposite trend. Increasing ensiling period and Molasses addition to rice straw silage significantly increased (P<0.05) CP and NFE and significantly decreased (P<0.05) CF. Bacterial inoculants with molassessupplementation and ensiled for 60 days increased in vitro gas production fractions (a&b), gas production rate (c), Gas production from the fermentation of soluble fraction (GPSF) and insoluble fraction (GPNSF), short chain fatty acids concentration (SCFA), DM intake (DMI), organic matter digestibility (OMD), metabolizable energy (ME) and net energy (NE) and in vitro DM degradability (IVDMD) and CB more effective than LAB and the LAB1 + CB1 with molasses additive showed the highest values. Keywords: Green rice straw silage, bacterial inoculants, fermentation characteristics, chemical composition and In vitro gas production.