The effects of combined use of soybean extract and mixture of several plant oils in juvenile nile tilapia
This study investigated the effects of combined dietary fish meal and oil replacement by soybean extract and increasing amount of plant oil mixture on growth performance, whole body and tissue amino acid and fatty acid compositions in Nile tilapia (Oreochromis niloticus). Diets in which 50% of the fish meal crude protein was replaced by soy bean extract along with 60, 80 and 100% of fish oil replacement by mixture of soy, canola and linseed oils (v/v, 1:1:1) were used in the study. Four iso-nitrogenous and iso-energetic experimental diets were prepared and fed to juvenile Nile tilapia (25 fish per tank with average wet weight of 16.24 u00b1 0.66 g) twice in equal portions during morning (09:00-10:00 h) and afternoon (17:00-18:00) at a fixed rate of 4% BW.d-1 for 84 days. At the end of 84 day grow out period growth parameters and whole body and muscle tissue amino acid and fatty acid compositions were assessed. Fish in each dietary treatment more than doubled its initial average weight and no statistical differences (P>0.05) were found among dietary treatments in terms of measured growth parameters.
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