Effects of dietary tea polyphenols on growth, biochemical and antioxidant responses, fatty acid composition and expression of lipid metabolism related genes of large yellow croaker(Larimichthys crocea)

Abstract

The study was conducted to investigate the effects of dietary tea polyphenols (TP) on growth performance, biochemical and antioxidants responses, fatty acid composition, and lipid metabolism-related gene expressions of large yellow croaker (Larimichthys crocea). Four diets were formulated with different levels of TP (0.00%, 0.01%, 0.02% and 0.05%). Results showed that growth performance of L. croceawere not different among dietary treatments. Compared with the control group, fish in 0.02% TP group had lower body and hepatic lipid content and lower total cholesterol content. The minimum content of triglycerides and low-density lipoproteincholesterol were found in 0.05% TP group. Hepatic n-6 PUFA and n-3 PUFA were significantly higher in TP supplementation groups. Malondialdehyde content was lower in TP supplementation groups, and superoxide dismutase activity was higher in 0.01% TP group than the control group. The mRNA expressions of carnitine palmitoyltransferase1, acyl-CoA oxidase and peroxisome proliferators-activated receptor a were up-regulated in 0.01% and 0.02% TP groups, while lipoprotein lipase expression was down-regulated in TP supplementation groups than the control group. Results suggested that 0.01%-0.02% TP supplementation could reduce the deposition of liver lipid of L. crocea caused by high-lipid diet, which might be due to the increase in lipid oxidation related gene expressions.

Effects of dietary pomegranate peel meal on the growth performance, blood indices, and innate immune response of rainbow trout (Oncorhynchus mykiss)

“…In concurrent with the present study, several medicinal herbs resulted in improving the growth rate, probably due to the increased palatability which associated with increased feed intake (Sarhadi et al, 2020;Srichaiyo et al, 2020). However, the high supplementation levels decreased the growth performance, which can be attributed to the high contents of polyphenols and fibers (Ji et al, 2018). Furthermore, the depressive effects on the growth of medicinal plants may be related to toxic constituents, excessive doses, or allergic conditions (Yılmaz et al, 2012;Yılmaz et al, 2013).…”

Effects of dietary silymarin (SM) supplementation on growth performance, digestive enzyme activities, antioxidant capacity and lipid metabolism gene expression in large yellow croaker ( Larimichthys crocea ) larvae

“…Large yellow croaker ( Larimichthys crocea ) is the most widely cultured marine fish species in China due to its high nutritive value, pleasant taste and natural resource depletion (Du et al., 2017; Ji et al., 2018; Liu et al., 2020). Previous studies have investigated the nutritional requirement, feeding habits and development of digestive system of large yellow croaker larvae (Ai et al., 2008; Feng, Cai, Zuo, Mai, & Ai, 2017; Mai et al., 2005; Xie, Ai, Mai, Xu, & Wang, 2012).…”

Dietary tea polyphenols change flesh quality with dose‐related manner in the GIFT tilapia fed with a high‐fat diet

“…Recently, TP has also been applied in fish feeds and showed some positive effects, such as improving growth performance, antioxidant activity and lipid utilization (Hwang et al, 2012;Ji et al, 2017).…”

“…Based on these beneficial effects, therefore, TP has been widely used in food processing and livestock production. Recently, TP has also been applied in fish feeds and showed some positive effects, such as improving growth performance, antioxidant activity and lipid utilization (Hwang et al., 2012; Ji et al., 2017). However, the effects of dietary TP supplementation on flesh quality have not been well investigated.…”