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Superior growth performance in broiler chicks fed chelated compared to inorganic zinc in presence of elevated dietary copper

查看全文 作　　者：Junmei [1]Zhao;Robert B. [1,2]Shirley;Julia J. [1]Dibner;Karen J. [1]Wedekind;Frances [1]Yan;Paula [1]Fisher;Thomas R. [1]Hampton;Joseph L. [1]Evans;Mercedes Vazquez-[1]Anon 高影响力作者 机构地区：[1]research and development,novus international,20 Research Park Drive,Saint Charles,MO 63304,USA;[2]current affiliation:poultry technical services,adisseo usa,Alpharetta,GA 30022,USA高影响力机构 出　　处：《Journal of Animal Science and Biotechnology》索引2016年第7卷第4期,共9页高影响力期刊 摘　　要：Background: The goal of this study was to compare the antagonism of elevated dietary Cu(250 mg/kg) from Cu SO4 on three different Zn sources(Zn SO4· H2O; [Zn bis(-2-hydroxy-4-(methylthio)butanoic acid)], Zn(HMTBa)2,a chelated Zn methionine hydroxy analogue; and Zn-Methionine), as measured using multiple indices of animal performance in ROSS 308 broilers.Methods: Three experiments were conducted in broiler chicks fed a semi-purified diet. Al birds were fed a Zn-deficient diet(8.5 mg/kg diet) for 1 wk, and then provided with the experimental diets for 2 wks.Results: Experiment 1 was a 2 × 2 factorial design with two levels of Cu(8 vs. 250 mg/kg diet from Cu SO4) and two Zn sources at 30 mg/kg [Zn SO4· H2 O vs. Zn(HMTBa)2]. Elevated Cu impaired growth performance only in birds fed Zn SO4.Compared to Zn SO4· H2 O, Zn(HMTBa)2improved feed intake(12 %; P < 0.001) and weight gain(12 %, P < 0.001) and the benefits were more pronounced in the presence of 250 mg/kg diet Cu. Experiment 2 was a dose titration of Zn SO4· H2 O and Zn(HMTBa)2at 30, 45, 60, and 75 mg/kg diet in the presence of 250 mg/kg Cu SO4. Feed:gain was decreased and tibia Zn was increased with increasing Zn levels from 30 to 75 mg/kg. Birds fed Zn(HMTBa)2consumed more food and gained more weight compared to birds fed Zn SO4, especially at lower supplementation levels(30 and45 mg/kg; interaction P < 0,05). Experiment 3 compared two organic Zn sources(Zn(HMTBa)2vs. Zn-Methionine)at 30 mg/kg with or without 250 mg/kg Cu SO4. No interactions were observed between Zn sources and Cu levels on performance or tissue mineral concentrations. High dietary Cu decreased weight gain(P < 0.01). Tibia Cu and liver Cu were significantly increased with 250 mg/kg dietary Cu supplementation(P < 0.01). No difference was observed between the two Zn sources.Conclusions: Dietary 250 mg/kg Cu significantly impaired feed intake and weight gain in birds fed Zn SO4· H2 O,but had less impact in birds fed Zn(HMTBa)2. No difference was observed between the two organic zinc sources.These results are consistent with the hypothesis that chelated organic Zn is better utilized than inorganic zinc in the presence of elevated Cu. 关 键 词：性能比较 无机锌 螯合锌 高铜 肉鸡 蛋氨酸羟基类似物 生长 ZnSO4
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