Valorization of Squid Processing Waste as Animal Feed Ingredient by Acid Ensilaging Process

Abstract

The present study focused on utilization of industrial squid processing waste for preparation of silage by adding different concentrations of formic acid and best one was supplemented to the animal feed. Squid processing waste was collected from a processing plant located at Cochin and commercial grade formic acid was added with different concentrations such as 2.5% (T1), 3% (T2) and 3.5% (T3). The study analyzed biochemical changes during ensilaging process of 14 days with sampling on every alternative day. Changes like degree of hydrolysis, protein and lipid degradation products were studied. Increase in non-protein nitrogen, free alpha'-amino nitrogen and total volatile basic nitrogen contents during ensilaging process were significant (p < 0.05) and indicated the hydrolysis of protein. Slight reduction of Peroxide value from 8th day onwards showed degradation of primary lipid oxidation products which reflected as increment in secondary lipid oxidation products in later stage at 3% (T2) and 3.5% concentration (T3). T1 silage was spoiled and gave ammoniacal smell during storage. However, T2 silage with low pH can be used as animal feed supplement. Utilization of these wastes provides more revenue to seafood and related sectors.