title: Dietary available phosphorus affected growth performance, body composition, and hepatic antioxidant property of juvenile yellow catfish Pelteobagrus fulvidraco.
abstract: An 8-week feeding trial was carried out with juvenile yellow catfish to study the effects of dietary available phosphorus (P) on growth performance, body composition, and hepatic antioxidant property. Six pellet diets were formulated to contain graded available P levels at 0.33, 0.56, 0.81, 1.15, 1.31, and 1.57% of dry matter, respectively. Triplicate tanks with each tank containing 60 juveniles (3.09 ± 0.03 g) were fed one of the six experimental diets for 8 weeks. Specific growth rate, feeding rate, and protein efficiency ratio were significantly higher at 0.81% dietary available P. Efficiency of P utilization distinctly decreased with increasing P level. Body lipid content significantly decreased while body ash and feces P content significantly increased with increasing P level. Quadratic regression analysis indicated that vertebrae P content was maximized at 1.21% dietary available P. Fish fed 1.57% dietary available P had highest activity of hepatic superoxide dismutase and catalase and malonaldehyde content. In conclusion, decreasing dietary available P increased P utilization efficiency and body lipid content while decreased vertebrae P content. Juvenile yellow catfish were subjected to oxidative damage under the condition of high dietary P content (1.57%), and the damage could not be eradicated by their own antioxidant defense system.
authors.affiliation: College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Tang
authors.forename: Chunfang
authors.initials: C
authors.lastname: Wang
authors.forename: Congxin
authors.initials: C
authors.lastname: Xie
authors.forename: Jiali
authors.initials: J
authors.lastname: Jin
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Huang
mesh_terms: D000821:Animal Feed; D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001823:Body Composition / Q000187:drug effects*; D002374:Catalase / Q000378:metabolism; D002397:Catfishes / Q000254:growth & development* / Q000378:metabolism; D005243:Feces / Q000737:chemistry; D005526:Food, Formulated; D050356:Lipid Metabolism; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress; D010758:Phosphorus / Q000008:administration & dosage / Q000378:metabolism*; D016226:Phosphorus, Dietary / Q000008:administration & dosage / Q000494:pharmacology*; D012044:Regression Analysis; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D016226:Phosphorus, Dietary; D010758:Phosphorus; D008315:Malondialdehyde; D002374:Catalase; D013482:Superoxide Dismutase