Effects of dietary leucine on growth performance, feed utilization, non-specific immune responses and gut morphology of juvenile golden pompano Trachinotus ovatus
文献类型： 外文期刊
作者： Tan, Xiaohong 1 ; Lin, Heizhao 1 ; Huang, Zhong 1 ; Zhou, Chuanpeng 1 ; Wang, Anli 2 ; Qi, Changle 1 ; Zhao, Shuyan 1 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Minist Agr, Key Lab South China Sea Fishery Resources Exploit, Guangzhou 510300, Guangdong, Peoples R China
2.South China Normal Univ, Coll Life Sci, Key Lab Ecol & Environm Sci Guangdong Higher Educ, Guangdong Prov Key Lab Hlth & Safe Aquaculture, Guangzhou 510631, Guangdong, Peoples R China
3.Chinese Acad Fishery Sci, Shenzhen Base South China Sea Fisheries Res Inst, Shenzhen 518121, Peoples R China
关键词： Trachinotus ovatus; Leucine requirement; Growth performance; Serum biochemical indices; Non-specific immune responses; Gut morphology
期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）
ISSN： 0044-8486
年卷期： 2016 年 465 卷
页码：
收录情况： SCI
摘要： The effects of dietary leucine on growth performance, feed utilization, non-specific immune responses and gut morphology were studied in juvenile golden pompano (Trachinotus ovatus) using 8-week feeding trials. Six isonitrogenous and isolipidic diets were formulated to contain six graded levels of dietary leucine (16.2, 20.9, 26.0, 30.7, 35.9 and 41.0 g kg(-1) leucine of dry diet). Each diet was randomly assigned to triplicate groups of 20 juvenile fish (5.76 +/- 0.06 g). Maximum weight gain rate (WG), specific growth rate (SGR), feed intake (FI), protein efficiency ratio (PER), microvilli numbers and microvilli length in foregut and midgut were recorded at 30.7 g kg(-1) dietary leucine. Protein deposition ratio (PDR), hemoglobin (HGB) and hematocrit (HCT) were found to be optimal in fish fed with 35.9 g kg(-1) leucine of diet. Dietary leucine levels had a significant effect on serum superoxide dismutase (SOD), malondialdehyde (MDA), lysozyme (LZY) and total antioxidant capacity (T-AOC) (P < 0.05). Intestinal microstructures were positively affected by dietary leucine at the optimal levels of 26.0 and 30.7 g kg(-1), significantly (P < 0.05) increasing microvilli numbers and microvilli length in foregut and midgut. Based on the growth performance, feed utilization, proximate composition, serum enzyme activities and gut morphology, the optimum dietary leucine level for optimal growth of juvenile golden pompano was 29.3-32.9 g kg-1 of the dry diet, corresponding to 71.5-80.2 g kg(-1) of dietary protein. Statement of relevance: The study indicated low or excess amount of dietary leucine decreased growth performance, serum total antioxidant capacity and had a significantly negative effect on gut morphology. The optimum dietary leucine level for juvenile golden pompano was 2.93-3.29% of the dry diet. The results provide a theoretical basis for the designing of feed formulation for golden pompano (T. ovatus). (C) 2016 Elsevier B.V. All rights reserved.
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