This experiment was conducted to evaluate the effect of soybean meal (SM) as a substitute for fish meal (FM) in practical diets for juvenile genetic improvement of fanned tilapia (GIFT). A total of 360 fish with an average body weight of (5.80±0.17) g were randomly divided into 6 groups (control group and 5 experimental groups) with 3 replicates each, and each replicate contained 20 fish. Six diets were formulated to be isonitrogenous (33.8%) and isoenergetic (16.50 MJ/kg). The diet with 20% FM and without SM served as a control group diet. Five experimental diets were supplemented with FM replaced by 20%, 40%, 60%, 80% and 100% SM, respectively. The experiment lasted for 60 days. The results showed as follows: 1) the feed intake (FI), specific growth rate (SGR), feed efficiency ratio (FER) and protein efficiency ratio (PER) of fish fed diets supplemented with SM instead of 20% to 80% FM were similar to those of fish fed the control diet. When SM was used instead of 100% FM, those indexes were decreased by 10% approximately, but no significant differences were found between the control and other experimental groups (P>0.05). 2) No significant differences in carcass protein and ash contents were found among all treatments (P>0.05). 3) With increasing the proportion of SM instead of FM, lipid content and intestinalsomatic index (ISI) were decreased (P>0.05) and viscerasomatic index (VSI) was increased (P>0.05). The diet supplemented with SM instead of 100% FM had significant effects on ISI and VSI compared with the control diet (P<0.05). 4) The contents of total protein (TP), cholesterol (CHOL), triglyceride (TG), calcium (Ca), phosphorus (PHOS) in plasma of fish fed diet supplemented with SM instead of 100% FM were lower than those of fish fed the control diet (P>0.05), and the content of thyroxin in serum was significantly lower than that of fish fed the control diet (P<0.05). The results indicate that SM can be replaced up to 80% FM in practical diets of GIFT. But the anti-nutritional factors and suboptimal levels of essential amino acids (Lysine and methionice+cystine) in SM may be major negative effects on growth and feed conversion ratio of GIFT.［Chinese Journal of Animal Nutrition, 2011, 23（10）：1840 -1846］
ZHAO Haixiang,FENG Jian,NING Yi,PAN Yanyun,ZHAO Hualin
. Evaluation of Soybean Meal as a Substitute for Fish Meal in Practical Diets for Juvenile Genetic Improrement of Fanned Tilapia[J]. Chinese Journal of Animal Nutrition, 2011
, 23(10)
: 1840
-1846
.
DOI: 10.3969/j.issn.1006-267x.2011.10.027
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