实用饲料补充结晶或包膜赖氨酸对草鱼生长、血清游离氨基酸和肌肉蛋白质合成率的影响

研究设计 4种试验饲料 (纯化饲料、实用饲料以及分别补充结晶和包膜赖氨酸的两种实用饲料 )。试验草鱼放养在玻璃钢水族箱 (10 0cm× 5 0cm× 5 0cm)中 ,每箱放养 30尾 (平均体重 7.2 7± 0 .5g) ,每种处理设 3个平行组 ,饲养 9周。试验结果表明 ,纯化饲料组的增重率和蛋白质合成率 (Ks)明显高于 3组实用饲料 (P <0 .0 5 )。实用饲料补充包膜赖氨酸与不补充或补充结晶赖氨酸比较 ,增重率、蛋白质效率、血清必需氨基酸平衡指数(EAAP)和蛋白质合成率都得到改善。包膜赖氨酸 ,是补充饲料蛋白质的一种很好的途径。

Influence of practical diet supplementation with free or coated lysine on the growth, plasma free amino acids and protein synthesis rates in the muscle of Ctenopharyngodon idellus

Four experiment diets were designed (purified diet , practical diet and practical diet with lysine uncoated or coated ) . Grass carp (mean weight of 7. 27 ±0. 5g) were fed separately in 12 fiberglass tanks (100cm ×50cm ×50cm) with 30 fish per tank. Every experiment diet was taken three repeats. The experiments lasted 9 weeks. Results indicated that grass carp fed with the purified diet showed a significantly higher growth ratio and protein synthesis rate ( Ks) than fish fed with the practical diet ( P < 0. 05) . Practical diet with coated lysineimproved the growth rate, feed conversion, balance of essential amino acid in plasma (BEAAp ) and protein synthesis rate ( Ks) in comparison with diet with lysine uncoated or deficiency. Coated lysine , but not free lysine , proved to be a significantly better way of dietary protein supplementation.