Supplemental effect of cholyltaurine and soybean lecithin to a soybean meal-based fish meal-free diet on hepatic and intestinal morphology of rainbow trout <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> |
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| Authors: | Yasuro Iwashita Nobuhiro Suzuki Takeshi Yamamoto Jun-ichirou Shibata Keiichirou Isokawa Ang H Soon Yuto Ikehata Hirofumi Furuita Tsuyoshi Sugita Takanobu Goto |
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| Institution: | (1) Department of Fisheries, School of Marine Science and Technology, Tokai University, 424-8610 Shimizu, Shizuoka, Japan;(2) Feed Research Group, Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, 519-0423 Tamaki, Mie, Japan;(3) Department of Chemistry and Biochemistry, Numazu College of Technology, 4108501 Numazu, Shizuoka, Japan |
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| Abstract: | The supplemental effects of cholyltaurine and soybean lecithin to a defatted soybean meal (SBM)-based fish meal-free diet
on the hepatic and intestinal morphology of rainbow trout Oncorhynchus mykiss were investigated. A fish meal-based diet (FM), three fish meal-free diets supplemented either with soybean lecithin (SL),
bovine gall powder (BG) or cholyltaurine (C-tau) and an unsupplemented fish meal-free diet (NFM), were given to fish (−11
g) for 10 weeks. The growth was the lowest in fish fed diet NFM, intermediate in fish fed diet SL and the highest in fish
fed diet FM, BG and C-tau. Hepatocytes of fish fed diet NFM were atrophied, and the distal intestine of these fish showed
abnormal features: disintegrated microvilli and fatty degeneration in epithelial cells and increased amount of connective
tissue in the submucosa. Hepatic and intestinal histological features in fish fed diets SL, BG and C-tau were similar to those
in fish fed diet FM. These results indicate that soybean lecithin, bovine bile salts and cholyltaurine have similar effects
on normalizing the hepatic and intestinal morphologies of rainbow trout fed the SBM-based diet, although growth promotion
effect was limited in the soybean lecithin. |
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| Keywords: | cholyltaurine intestine lecithin liver morphology Oncorhynchus mykiss soybean meal |
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