Molecular Nutrition

Effects of Different Diets on Growth Performance, Body Composition and Digestive Enzyme Activities of Juvenile Chinese Giant Salamander (Andrias davidiaus)

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  • 1. Jiangsu Polytechnic College of Agriculture and Forestry, Zhenjiang 212400, China;
    2. Jurong Chinese Giant Salamander Propagation Center of Longquan of Jiangsu Province, Zhenjiang 212400, China

Received date: 2017-03-13

  Online published: 2017-09-28

Abstract

In order to determine the optimal diet, this experiment was conducted to investigate the effects of different diets on growth performance, body composition and digestive enzyme activities of juvenile Chinese giant salamander (Andrias davidiaus). A total of 300 juvenile Chinese giant salamander with the average body weight of (1.08±0.01) g were randomly divided into 5 groups with 3 replicates per group and 20 fish per replicate. Fish in the 5 groups were fed 5 different diets for 60 d, and the diets were raw fish block, Tenebrio molitor L., tubifex, brine shrimp and caridina, respectively. The results showed that no significant differences in survival rate (SR), and the contents of moisture and ash in whole body were found among all groups (P>0.05). Final body weight, weight gain rate (WGR), specific growth rate (SGR) of juveniles fed caridina were significantly higher than juveniles fed tubifex and brine shrimp (P<0.05), while condition factor (CF) of juveniles fed Tenebrio molitor L. and tubifex was significantly higher than juveniles fed brine shrimp (P<0.05). For dry matter efficiency ratio, the raw fish block and tubifex groups was significantly higher than the other groups (P<0.05), the caridina group was significantly higher than the brine shrimp and Tenebrio molitor L. groups (P<0.05), and the brine shrimp group was significantly higher than the Tenebrio molitor L. group (P<0.05). Protein efficiency ratio had significant difference among different groups (P<0.05), and it presented as tubifex group>caridina group>raw fish block group>brine shrimp group>Tenebrio molitor L. group. Lipid efficiency ratio of juveniles in the raw fish block group was significantly higher than that in the other groups (P<0.05), that in the brine shrimp and caridina groups was significantly higher than that in the tubifex and Tenebrio molitor L. group (P<0.05), and that in the tubifex group was significantly higher than that in the Tenebrio molitor L. group (P<0.05). The content of crude protein in whole body of juveniles in the caridina group was the highest among all groups, and it was significantly higher than that in the Tenebrio molitor L. and brine shrimp groups (P<0.05); whereas, the content of ether extract in whole body of juveniles in the Tenebrio molitor L. group was the highest among all groups, and it was significantly higher than that in the other groups (P<0.05). No significant differences in the contents of 17 kinds of amino acids, total amino acids, essential amino acids and delicious amino acids in whole body of juveniles were found among all groups (P>0.05), but the essential amino acids/non-essential amino acids in the tubifex, brine shrimp and caridina groups was significantly higher than that in the raw fish block and Tenebrio molitor L. groups (P<0.05). Proteases activity in gastrointestinal tract of juveniles fed raw fish and caridina was significantly higher than juveniles fed Tenebrio molitor L. and brine shrimp (P<0.05), while lipase activity in gastrointestinal tract of juveniles fed Tenebrio molitor L. was significantly higher than juveniles fed other diets (P<0.05). The lowest amylase activity in gastrointestinal tract of juveniles was observed in the brine shrimp group, and it was significantly lower than that in the other groups (P<0.05). The results suggest that caridina is optimal diet for juvenile Chinese giant salamander, raw fish block comes second, and tubifex and Tenebrio molitor L. are final choices.

Cite this article

CHEN Jun, ZOU Peng, WANG Yuheng, WANG Huicong, LUO Guilan, TANG Chuanquan . Effects of Different Diets on Growth Performance, Body Composition and Digestive Enzyme Activities of Juvenile Chinese Giant Salamander (Andrias davidiaus)[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3726 -3736 . DOI: 10.3969/j.issn.1006-267x.2017.10.036

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