Proteína hidrolisada de frango em dietas para juvenis de tilápia-do-nilo

Abstract

The effects of graded levels of dietary chicken protein hydrolysate (CPH) inclusion on growth performance, hematological and biochemical responses and liver, gut and muscle histology by juveniles of Nile tilapia were analyzed. Fish with 221.37 ± 2.58 g of average body weight (n = 240) were randomly distributed in 24 conical tanks (420 L each) and fed with diets containing 0; 1; 2; 3; 4 and 5% of CPH. The fish were fed four times a day, ad libitium, during 30 days. The experimental design was entirely randomized with six treatments and four replicates. The best results (P<0.05) for fillet yield was observed for diets containing 4%CPH when comparing with diet no supplemented. For this diet also was observer lower gut weight (P<0.05). Likewise, head and gut weight were lower (P<0.05) for fish fed 1%CPH diet. The fillet fat was different between diets containing 3 and 5%CPH, being lower for the highest level. Significant reduction was observed for plasma triglycerides at 2% and above this level. Significant increase on HDL and concomitant reduction on VLDL was observed for fish fed 4 and 5%CPH diets. For thickness of the intestinal epithelium effects (P<0.05) was observed between diets containing 1 and 4%CPH. The inclusion of 4% PHF resulted in increased fillet yield, morphometric gut modification and changes in energy metabolism, additional studies evaluating the effects of PHF on physiological aspects are necessary to establish inclusion levels.