Effect of sesame straw processed by low steam, sulfuric acid and Natozyme enzyme on digestibility and in vitro gas production

This experiment was conducted to investigate the effect of processing with low steam pressure, sulfuric acid and Natozyme enzyme mixture on digestibility and in vitro gas production parameters of sesame straw. Experimental treatments were two levels of 0 and one bar steam pressure in 120 min and 130 °c, two levels of 0 and 2.4% sulfuric acid, and two levels of 0 and 3 gr/kg/DM exogenous enzyme. Chemical composition, in vitro digestibility and gas production parameters of the samples were determined. Processing caused to significant decrease of  dry matter, crude protein, neutral detergent fiber (NDF), acid detergent fiber (ADF) and lignin content of sesame straw (P< 0.05). Processing by acid, steam and enzyme decreased the lignin by 4%.  Processing by water decreased the ADF content of samples from 46.89% in the control treatment to 26.48%. Processing influenced gas production, cell wall degradability and digestibility of neutral detergent fiber (P<0.05). The greatest potential of gas production (53.55 mL) was related to the sesame straw processed by acid - steam - enzyme and the greatest rate of gas production (0.0283 ml/h) was belonged to the sesame straw processed by steam– enzyme. Sesame straw processed by acid- steam- enzyme had the greatest digestibility of NDF (55.45%) and ADF (45.83%).Therefore the result of this experiment showed processing of sesame straw by acid- steam- enzyme had the best effect on decrease of lignin content of samples. Also cell wall degradability, potential of gas production, microbial biomass and digestibility of ADF and NDF of sesame straw processed with this treatment was more appropriate than the other treatments.