Effect of poultry waste powder supplemented with papain, phytase, and pepsin enzymes on digestion and growth of common carp, Cyprinus carpio L.

This study was conducted to investigate the feasibility of using poultry waste as feed powder in the common carp diet. For this purpose, the poultry waste powder was mixed with 2.5 and 3.5% of enzymes of papain, phytase, and pepsin, and their effects on the digestion and growth parameters of the fish were investigated. A total of 84 fish were divided into 14, 250L tanks at a density of 1.52g/l or 6 fish, with two replicates per treatment. Based on the results, the highest weight gain was found in T6 (99.17g), and the lowest rates in T2 (74.17g). T3 had a 57.02% increase in relative growth, T5 showed specific growth of 0.29g/day, and T4 had a decrease in food conversion efficiency (276.9%). The results revealed that enzymes improve metabolism, fish’s utilization of diets, and increase growth rates and weight gain.