Effects of dietary supplementary leucine in a wheat meal-rich diet on the growth performance and immunity of juvenile gibel carp (Carassius auratus gibelio var. CAS III)
文献类型： 外文期刊
作者： Lin, Yan 1 ; Dengu, Jack Mike 2 ; Miao, Ling-Hong 1 ; Simon, Brtros 2 ; Pan, Wen-Jing 1 ; Liu, Bo 1 ; Ge, Xian-Ping 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Minist Agr, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Wuxi, Jiangsu, Peoples R China
2.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi, Jiangsu, Peoples R China
关键词： carbohydrate‐ rich diet; Gibel carp; immunity; leucine supplementation
期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）
ISSN： 1355-557X
年卷期： 2021 年 52 卷 4 期
页码：
收录情况： SCI
摘要： Leucine has been reported to regulate key metabolic pathways, including growth, immunity and antioxidative defence. To study the effects of dietary leucine supplementation in a carbohydrate-rich diet on juvenile gibel carp (Carassius auratus gibelio var. CAS III), an 8-week feeding trial was conducted on gibel carp juveniles reared on an experimental wheat meal-rich diet (40%) with varying leucine contents (0.87%, 1.23%, 1.68%, 2.10%, 2.41% and 2.83%). No significant changes in growth performance were observed regardless of leucine levels (p > 0.05). However, proper leucine levels (1.68% and 2.10%) could increase the accumulation of whole-body crude protein and decrease the accumulation of crude lipid. Furthermore, significant liver tissue damage occurred at 1.23% and 1.68% dietary leucine levels, whereas 2.10% and 2.41% dietary leucine could improve the antioxidant capacity at the end of the 8-week feeding trial. 1.68% and 2.10% dietary leucine levels could alleviate the hyperglycaemia caused by high carbohydrate intake after the 8-week feeding trial, as well as the elevated glucose content after starvation, to maintain normal metabolic conditions. Supplementation with leucine could significantly downregulate IL-1 beta, TNF-alpha 1, MyD88 and TIRAP mRNA levels during the 8-week feeding trial and after starvation for 48 h. In conclusion, 2.10%-2.41% leucine contents in a carbohydrate-rich diet could benefit muscle protein deposition, hyperglycaemia and hyperlipidaemia alleviation, and results in non-specific immunity improvement.
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