feather is efficiently degraded to produce free amino acids, soluble peptides, and thiol groups (Yong et al. 2013). The resulting fermentation supernatant was sampled and used for evaluation of antioxidative activity by the FRAP assay. Antioxidative activity occurred across the whole time course of fermentation, being highest at 72 h, which was similar to previous studies even when feather fermentation was performed using other bacterial species (Fakhfakhet al. 2011; Fontoura et al. 2014).