Open AccessEffects of Dietary Recombinant Bovine Somatotropin Levels on Growth, Plasma Recombinant Bovine Somatotropin Concentrations, and Body Composition of Juvenile Korean Rockfish, Sebastes schlegeli
Author(s) -
Yoo Gwangyeol,
Lee Seunghyung,
Park Gun Jun,
Choi SeMin,
Eme Okorie Okorie,
Kim Young Chul,
Kim KangWoong,
Kang YongJin,
Bai Sungchul C.
Publication year - 2007
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.2007.00089.x
Subject(s) - bovine somatotropin , biology , zoology , sebastes , rockfish , feed conversion ratio , recombinant dna , body weight , fish <actinopterygii> , fishery , endocrinology , biochemistry , gene
This experiment was conducted to study the effects of the graded recombinant bovine somatotropin (rBST) levels on growth, plasma rBST concentrations, and body composition of Korean rockfish, Sebastes schlegeli , and to estimate the optimum oral dosage of rBST. Seven experimental diets were formulated to be isonitrogenous and isocaloric and to contain 49.0% crude protein and 16.7 kJ available energy/g, with 0, 5, 10, 15, 20, 25, or 50 mg rBST/kg body weight (BW)/wk (rBST 0 , rBST 5 , rBST 10 , rBST 15 , rBST 20 , rBST 25 , and rBST 50 , respectively). After the feeding trial, fish fed all the diets supplemented with rBST showed higher weight gain (WG), feed efficiency (FE), specific growth rate (SGR), and protein efficiency ratio (PER) than those fed the rBST 0 diet ( P < 0.05). WG of fish fed rBST 15 , rBST 20 , rBST 25 , and rBST 50 diets was significantly higher than that of fish fed rBST 0 and rBST 5 diets ( P < 0.05); however, there were no significant differences among fish fed rBST 10 , rBST 15 , rBST 20 , rBST 25 , and rBST 50 diets. FE of fish fed rBST 15 and rBST 20 diets was significantly higher than that of fish fed rBST 0 , rBST 5 , rBST 10 , and rBST 50 diets, and fish fed rBST 10 , rBST 25 , and rBST 50 diets had significantly higher FE than those fed rBST 0 and rBST 5 diets ( P < 0.05). SGR of fish fed all the diets supplemented with rBST was significantly higher than that of fish fed rBST 0 diet ( P < 0.05); however, there were no significant differences among fish fed all the diets supplemented with rBST. PER of fish fed rBST 15 and rBST 20 diets was significantly higher than that of fish fed rBST 0 , rBST 5 , and rBST 50 diets, and fish fed rBST 10 , rBST 25 , and rBST 50 diets had significantly higher PER than those fed rBST 0 and rBST 5 diets ( P < 0.05). Whole‐body protein of fish fed rBST 15 diet was significantly higher than that of fish fed rBST 0 , rBST 5 , and rBST 10 diets ( P < 0.05); however, there were no significant differences among fish fed rBST 15 , rBST 20 , rBST 25 , and rBST 50 diets. Plasma rBST concentrations of fish fed all the diets began to rise at 3 h after oral administration of rBST; the maximum plasma rBST concentration peaked at 12 h and returned to the basal level at 24 h. Broken‐line model analyses of WG and FE were 12.8 and 13.2 mg rBST/kg BW/wk, respectively. These results indicated that the optimum oral dosage could be greater than 12.8 mg rBST/kg BW/wk but less than 13.2 mg rBST/kg BW/wk in juvenile Korean rockfish.