Abstract
This study was carried out to evaluate whether silymarin supplementation influences growth, lipid metabolism, and health status in grass carp fed elevated dietary lipid levels. The juvenile fish (27.43 ± 0.17 g/tail) were fed six isonitrogenous and isocaloric diets in a factorial design containing 0, 100, or 200 mg kg−1 silymarin (SM0, SM100, SM200) associated with either 4 or 8 % lipid level (low lipid, LL, and high lipid, HL, respectively) for 82 days. The results showed that both dietary silymarin supplementation and high lipid level significantly enhanced growth performance (WG, SGR), protein efficiency ratio, and feed utilization. Silymarin supplementation significantly reduced the VSI, hepatic lipid content, and the total bilirubin concentration in the serum. The gallbladdersomatic index displayed higher in the SM100 groups than SM200 groups. Serum total cholesterol content exhibited lower in the SM100 groups than SM0 groups. Meanwhile, significant interactions were shown for hepatic gene expression of HSL and CPT1 by two factors, and SM100 group had higher hepatic gene expression of HSL and CPT1 in fish fed with the HL diets. The SM100 groups up-regulated hepatic gene expressions of HMGCR and CYP7A1 compared with the SM0 groups. Silymarin supplementation notably reduced the elevated serum MDA content induced by HL treatments. Thus, silymarin supplementation markedly promoted growth and protein efficiency, suppressed lipid accumulation, and improved health status in grass carp fed with high-lipid diets, which might be associated with its enhancement of lipolysis and β-oxidation, antioxidant capacity.
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Abbreviations
- ACC:
-
Acetyl coenzyme A carboxylase
- ATGL:
-
Adipose triglyceride lipase
- CF:
-
Condition factor
- CL:
-
Crude lipid
- CP:
-
Crude protein
- CPT-1:
-
Carnitine palmitoyl transferase 1
- CYP7A1:
-
Cholesterol 7α-hydroxylase
- DFI:
-
Day feed intake
- FAS:
-
Fatty acid synthase
- FBW:
-
Final average body weight
- FCR:
-
Feed conversion ratio
- GI:
-
Gallbladdersomatic index
- Glu:
-
Glucose
- HDL-c:
-
High-density lipoprotein cholesterol
- HL:
-
High lipid
- HMGCR:
-
3-Hydroxy-3-methylglutaryl-CoA reductase
- HPLC:
-
High-performance liquid chromatography
- HSI:
-
Hepatosomatic index
- HSL:
-
Hormone-sensitive lipase
- IBW:
-
Initial average body weight
- LDL-c:
-
Low-density lipoprotein cholesterol
- LL:
-
Low lipid
- LR:
-
Lipid retention
- MDA:
-
Malondialdehyde
- NEFA:
-
Nonesterified fatty acid
- PER:
-
Protein efficiency ratio
- PPV:
-
Protein productive value
- SGR:
-
Specific growth rate
- SM:
-
Silymarin
- SOD:
-
Superoxide dismutase
- SR:
-
Survival rate
- T-cho:
-
Total cholesterol
- TBil:
-
Total bilirubin
- TG:
-
Triacylglycerol
- VSI:
-
Viscerosomatic index
- WG:
-
Weight gain
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Acknowledgments
Financial support was provided by the National Basic Research Program of China Project No. 2014CB138603, Plan for Outstanding Young of Beijing Academy of Science and Technology Project No. 201420 and the fund of Beijing sunpu biochem. tech. co., Ltd, China. We thank Hua cheng aquaculture farm (Jiangsu, China) for their juvenile fish and School of Basic Medicine and Biological Science, Soochow University, for rearing condition support.
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Xiao, P., Ji, H., Ye, Y. et al. Dietary silymarin supplementation promotes growth performance and improves lipid metabolism and health status in grass carp (Ctenopharyngodon idellus) fed diets with elevated lipid levels. Fish Physiol Biochem 43, 245–263 (2017). https://doi.org/10.1007/s10695-016-0283-6
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DOI: https://doi.org/10.1007/s10695-016-0283-6