Investigation on the nutritional value of processed vetch wastes (vigna radiate) with electron beam, hydrogen peroxide and hydrobromic acid using gas production technique and batch culture method

This research was conducted to investigate the effects of electron beam (EB) (150 and 200 kGy), hydrogen peroxide (H2O2) (132 ml/kg DM), hydrobromic acid (HBr) (60 g/kg DM) and their combination on the gas production parameters and in vitro digestibility of vetch wastes. Processing increased gas production potential (P<0.05). The highest amount for this trait was observed in HBr, EB (150 and 200 kGy) and their combination. Except for HBr+ EB (150 and 200 kGy) (P>0.05), the other treatments increased gas production rate (P<0.05). In vitro digestibility of the dry matter (DM) and organic matter (OM) of samples was increased by EB, chemical compounds (H2O2 and HBr), and their combination (P< 0.05). Estimated parameters, including metabolizable energy (ME), net energy (NE) and short chain fatty acids (SCFAs) were increased by processing (P<0.05). The highest increase was observed for HBr and EB (200 kGy) treatments. Ammonia nitrogen (NH3-N) concentration was greater in HBr+ EB (150 kGy) than other treatments (P<0.05). Except for the EB (150 kGy) and HBr (P>0.05), the other treatments led to an increased partitioning factor (PF) and efficiency of microbial mass production (P<0.05). Overall, the processing improved the nutritional value of vetch wastes. In this case, treatments of EB, HBr and their combination had greater effect on the studied traits.