Effects of dietary knotweed levels on partial non-specific immunity and lipid metabolism in blood parrot
FAN Yun-shuo,CUI Pei,JI Yan-bin,YOU Hong-zheng WANG Xu QIAN Gang,ZHANG Chun-xiao,CHEN Xiao,ZHANG Zi-chao
1. College of Fisheries science, Tianjin Key Laboratory of Aqua-eeology and Aquaculture, Tianjin Agricultural University, Tianjin 300384, China; 2 Tianjin Ornamental Fish Technology Engineering, Tianjin 300042, China; 3. Tianjin Fisheries Research Institute, Tianjin 300042, China
Abstract: Blood parrot（Cichlasoma citrinellum ♂ × C.synspilum ♀） with body weight of（48.0 ± 3.5） g were fed to apparent satiation diets containing main protein sources of fish meal and soybean meal,fish oil at rate of 8% and14% of the basal diet and the high-fat diet supplemented with knotweed Polygonum cuspidatum at a rate of 0,0.5%,1.0%,1.5%,and 2.0% for 28 d with triplication to evaluate the feasible use of knotweed in aquaculture.The indices of partial non-specific immunity and lipid metabolism were determined in the blood parrot fed the diets 7,14,21,and 28 after administration.The results showed that the activities of liver superoxide dismutase（SOD）,lysozyme（LZM） and catalase（CAT） were found to be increased significantly with the increase in dietary knotweed level（P 〈 0.05）,and that malondialdehyde（MDA） content was decreased with the increase in dietary knotweed and activities of serum alanine aminotransferase（ALT） and aspartate transaminase（AST） was decreased with the increase in dietary knotweed,with significantly different between the maximal dietary knotweed group（2.0%） and the control group（P 〈 0.05） at the end of the experiment.There were decrease in contents of serum triglyceride（TG） and total cholesterol（CHOL） with the increase in dietary knotweed,without significant difference compared with those in the control group（P 〉 0.05）,without significant difference in contents of serum glucose（Glu）,high-density lipoprotein（HDL）,and low-density lipoprotein（LDL）（P 〉 0.05）.The liver lipoprotein lipase（LPL）,and hepatic lipase（HL） activities were shown to be declined,no significant difference（P 〉 0.05）.Fatty acid synthase（FAS） activity,however,was decreased significantly with the increase in dietary knotweed level（P 〈 0.05）.In summary,dietary knotweed can improve liver antioxidant capacity and lysozyme activity,and reduce liver injury and enhance the ability of lipid metabolism in blood parrot and it is recommend
2015, Vol. 30 
