ハマチに対する飼料脂質およびウルソデスオキシコ-ル酸の至適量〔ハマチの栄養要求に関する研究-3-〕

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In the present study, the provisional basal diet proposed previously was modified. This new diet was used to determine the required levels of squid liver and pollack liver oils for yellowtail in a feeding trial. In addition, the effects of ursodesoxycholic acid, a bile, on the growth of yellowtail and on feed efficiency were examined. The results obtained are as follows. 1. Replacement of the casein•gelatin mixture, used as the protein source of the provisional basal diet, by casein supplemented with some essential amino acids, was effective in elevating the untritional values of the basal diet. According, the modified diet was used as a basal diet in the present study. 2. The effects of suid liver and pollack liver oils on the growth of yellowtail and on feed efficiency were tested at various dietary lipid levels. The suitable of each lipid was estimated to be 9% for squid liver oil, containing approximately 27% HUFA, and 15% for pollack liver oil, containing approximately 14% HUFA. The nutritional value of diet containing squid liver oil was superior to that of the diet with pollack liver oil at a 9% dietary lipid level. These reaults suggest that amount of HUFA required by yellowtail is approximately 2% of diet. 3. Addition of ursodesoxycholic acied to a diet containing pollack liver oil at a 20% level improved the nutritional values of the diet; its optimum level was approximately 0.02% of diet.
日本水産學會の論文