The effects of replacing fish meal with skipjack tuna offal meal on the feed intake of local chickens; T0: (10% fish meal + 0% SSFO in feed); T1: (7.5% fish meal + 2.5% SSFO in feed); T2: (5% fish meal + 5% SSFO in feed); T3: (2.5% fish meal + 7.5% SSFO in feed); T4: (0% fish meal + 10% SSFO in feed).