Nutritive value of methionine-enriched soybean plastein for Oreochromis niloticus fry.
1988
Teshima S. | Kanazawa A.
Feeding trials using Oreochromis niloticus fry were conducted to examine the effects of supplemental methionine as crystalline amino acid or enriched soybean plastein on weight gain, feed conversion efficiency (FCE) and protein efficiency ratio (PER). The fry (about 0.4 g) were maintained on diets with the following nitrogen sources (35% crude protein) for 5 weeks: diet, soybean protein: gelatin (3:1); diet 2, soybean protein: gelatin (3:1) + crystalline methionine; diet 3, soybean protein: gelatin (3:1) + methionine-enriched soybean plastein: diet 4, casein: gelatin (3:1). The lowest and highest weight gains were attained on diets 1 and 4, respectively. Growth was not enhanced by supplementing diet 1 with crystalline methionine. However, supplementing diet 1 with methionine-enriched soybean plastein gave significant improvement: weight gain (P<0.05), FCE (P<0.10), and PER (P<0.10). These results indicate that methionine in soybean plastein is more effectively utilized by the fry O. niloticus than crystalline methionine. The present study proves the possibility of using methionine-enriched plastein to improve the nutritive value of methionine-deficient vegetable protein sources.
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