Supplemental effect of bile salts to soybean meal-based diet on growth and feed utilization of rainbow trout <Emphasis Type="Italic">Oncorhynchus mykiss</Emphasis> |
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| Authors: | Takeshi Yamamoto Nobuhiro Suzuki Hirofumi Furuita Tsuyoshi Sugita Natsumi Tanaka Takanobu Goto |
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| Institution: | (1) Feed Research Group, Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Hiruta, 519-0423 Tamaki, Mie, Japan;(2) Department of Fisheries, School of Marine Science and Technology, Tokai University, Orido, 424-8610 Shimizu, Shizuoka, Japan;(3) Department of Chemistry and Biochemistry, Numazu College of Technology, Ooka, 410-8501 Numazu, Shizuoka, Japan |
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| Abstract: | A feeding experiment was conducted to evaluate the supplemental effect of bile salts to a defatted soybean meal-based non-fish
meal diet for rainbow trout Oncorhynchus mykiss. A fish meal-based diet (FM) and two non-fish meal diets with and without bovine bile salts (SC+B and SC, respectively) were
fed to fish (13 g initial weight) for 10 weeks. Fish fed diet SC showed inferior growth and feed efficiency, while bile salt
supplementation improved the parameters to the same levels as fish fed diet FM. Crude fat and starch digestibility of diet
SC-fed fish decreased after the 10-week feeding trial compared to the data obtained with fish that had no experience of the
diet. Total biliary bile salt content and intestinal maltase activity of fish fed diet SC were the lowest among treatments,
while these parameters were improved by bile salt supplementation. Morphological changes occurred in the distal intestine
and liver of the diet SC group, although the histological features of fish fed diet SC+B were similar to those of fish fed
diet FM. These results suggest that bile salt supplementation to a soybean meal-based diet improves the nutrient utilization
by normalizing digestive processes in rainbow trout. |
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| Keywords: | bile salts diet fish meal intestinal morphology Oncorhynchus mykiss soybean meal |
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