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This study aimed to evaluate  the in vitro  digestibility of rice straw fermented with gamma-irradiated  Aspergillus niger . This study was also determined to evaluate  the in vitro  digestibility of the combination fermented rice straw and rice bran as ruminant rations. A 500 Gy gamma-irradiated  A. niger  was used for the fermentation process in rice straw by 21 days. Completely randomized design with six treatments and four replications was applied in this study. The treatments were: JNF (rice straw), JF (fermented rice straw), JNF 85 (85% rice straw + 15% rice bran), JF 85 (85% fermented rice straw + 15% rice bran), JNF 70 (70% rice straw + 30% rice bran), JF 70 (70% fermented rice straw + 30% rice bran). The observed variables were the nutrient content,  in vitro  gas production and  in vitro  true digestibility (IVTD). The results showed that fermentation treatment by gamma-irradiated  A. niger  could reduce ADF content of rice straw (P&lt;0.05). however, there was no significant difference in NDF content. JF 70 treatment produced the highest  in vitro  gas production (P&lt;0.05). JF 70 also produced the highest IVTD (P&lt;0.05). in conclusion, fermentation treatment by gamma-irradiated  A. niger  could reduce ADF content and increase IVTD. Adding rice bran in ruminant rations was also increase the availability of soluble nutrients for rumen microbes.

The effects of fermentation using gamma-irradiated Aspergillus niger and adding rice bran on rice straw digestibility: in vitro study