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Supplementation of varying levels of lysolecithinin in Nile tilapia (Oreochromis niloticus) diets were reduced 1% of crude protein containing total protein 29% at 0, 0.0125, 0.0250 and 0.0375 % in comparison withcontrol group (30% of crude protein) as a basal diet. The experiment was conducted to study the effects
of lysolecithin on nutrient digestibility and growth performance in tilapia with an average body weight of 4.15±0.10 g/fish. All fish were fed test diets twice a day to apparent satiation for 6 weeks. The results showed that lysolecithin supplementation at 0.0250 % increased significantly (p<0.05) digestibility coefficiency
(67.61±3.44), protein digestibility (79.54±2.17) and lipase activity (0.84±0.05). There were no differences in growth performance among treatments (p>0.05). However, feed conversion ratio (FCR) and protein efficiency ratio (PER) were best (p<0.05) for fish fed the diet supplemented with lysolecithin at 0.0250 %.
Supplementation of lysolecithin in the diets did not significantly (p<0.05) affect on protein gain (PG) in whole body and intraperitoneal fat, while hepatosomatic index increased significantly (p<0.05) compared with the control group but had a lower of feed production cost than those of the control. The reduction of 1% crude protein and supplementation of 0.0250% Lysolecithin in fish diet has improved protein digestibility and feed
conversion in fish related to decrease cost value of diet production.