農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

本研究係比較大豆蛋白含量不同的海鱺飼料中，添加複合胺基酸 (蛋胺酸、脯胺酸和三甲基甘胺酸) 作為攝餌促進劑之效果。以單一胺基酸作為攝餌促進劑，添加入完全以大豆粉為蛋白源的飼料中飼育海鱺苗時，其最高攝餌率各為：添加蛋胺酸1.5% 時的1.84%，添加脯胺酸1.15% 時的4.57% 和添加三甲基甘胺酸0.14% 時的1.35%。在以不同含量的大豆粉取代魚粉的飼料中，添加複合胺基酸 (蛋胺酸：脯胺酸：三甲基甘胺酸 = 2：1：0.1) 作為攝餌促進劑，飼育海鱺苗三週。結果顯示，活存率達100% 者為投飼大豆蛋白含量20%、60% 和 80% 組的海鱺苗。攝餌率最高者為投飼大豆蛋白含量0% 組的海鱺苗，最差者為大豆蛋白含量100%組，其攝餌率各為6.2% 和1.8%。增重率與飼料轉換率 (FCR) 表現最好的則是20% 組，其總增重率達263%，FCR為0.88。由上述結果顯示，在大豆蛋白含量不同的飼料中，添加複合胺基酸作為攝餌促進劑飼育海鱺苗，已確知大豆蛋白含量20% 的飼料，很明顯的可得到最佳的結果。另，若由攝餌率、增重率和飼料轉換率的變化來評估時，大豆蛋白取代魚粉蛋白的比例最高可達80%。

This study compared the effect of amino acids (L-methionine, L-proline, betain hydrochloride) fortified test diets containing graded levels of soy-protein for juvenile cobia. In the test of adding one amino acid to pure soy-protein diet as a feeding stimulant, the results showed that the best feed intake rates were 1.84% for L-methionine replaced at level of 1.5%, 4.57% for L-proline replaced at level of 1.15% and 1.35% for betain hydrochloride replaced at level of 0.14%.Fortified amino acids (L-methionine, L-proline, betain hydrochloride，2 : 1 : 0.1) as feeding stimulants were added to soy-protein replacement diets to find the best substitute level for juvenile cobia. The results showed the survival rate still maintain at 100% when the fish fed with diets of soy-protein replaced at levels of 20%, 60% and 80% for 3 weeks period. The highest feed intake rate was 6.2% when fish fed with diet of soy-protein replaced level at 0% and the lowest feed intake rate was 1.8% when fish fed with diet of soy-protein replaced level at 100%. However, the best weight gain and feed conversion ratio (FCR) occurred at soy-protein replaced level at 20%. They were 263% and 0.88, respectively.The results suggested that using amino acids as feeding stimulants added to soy-protein based diet at level of 20% could get the best feed intake, survival, weight gain and FCR results.