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The experiment was designed in a (4x3) factorial arrangement of treatments to investigate the effect of four different mixed protein schedules and three dietary Na/K ratios on Nile tilapia performance. The four protein schedules were achieved by alternating the diet (A ; 31%CP)and diet (B;24°/oCP)as follows (6-days~AX(5days~A/lday-B), (4days-A /2days-B) and (3days-A /3days-B).Meanwhile, sodium chloride was added to study the effect of Na/K ratio of 0.5 ,1.5 and 2 on utilization of dietary protein, amylase and lipase activity and serum thyroid hormone level. Moreover, the interaction between mixed protein schedules and Na/K ratio has been investigated. The results are summarized as follows: - The optimal protein schedule for tilapia performance was either

egyptian journal of aquatic biology and fisheries

EFFECT OF MIXED PROTEIN SCHEDULES ON NILE TILAPIA {ORE0CHROMIS NILOTICUS) PERFORMANCE IN COMBINATION WITH SOME FEED ADDITIVES I-MIXED PROTEIN SCHEDULES AND SODIUM CHLORIDE