Abstract
Native chicken feather keratin, commercial feather meal and soluble feather keratin derivatives (keratose, keratein and carboxymethyl feather keratin) were digested by several proteases (pronase, protin, papain and pancreatin) and the digestibility was compared. The digestibility of native feather keratin and commercial feather meal was 20 and 50~70% respectively with all proteases tested. Pronase and pancreatin were more effective in digesting the soluble feather keratin derivatives than the others. However, the different reaction patterns were observed on these two enzymes. Pronase’s action reached the equilibrium quickly but pancreatine’s action was gradual to attain the equilibrium.
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