Bioavailability evaluation of zinc-bearing palygorskite as a zinc source for broiler chickens
Bioavailability evaluation of zinc-bearing palygorskite as a zinc source for broiler chickens
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DOI：
10.1016/j.clay.2015.07.027
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发表时间：
2016
影响因子：
5.6
通讯作者：
Rui Yan;Lei Zhang;Xue Yang;C. Wen;Yanmin Zhou
中科院分区：
文献类型：
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作者：
Rui Yan;Lei Zhang;Xue Yang;C. Wen;Yanmin Zhou
本研究旨在评价含锌坡缕石（Zn-palygorinase，Zn-palygorinase）在肉鸡体内的生物利用度。试验选用432只1日龄爱拔益加肉仔鸡，随机分为9组，每组10只，分别进行42 d的不同日粮处理。在基础日粮中分别添加0、20、40、60和80 mg/kg饲料级硫酸锌和锌锌盐。添加锌对生长性能无显著影响（P> 0.05）。21日龄时，添加Zn-SO_4的肉鸡血液锌含量显著高于添加ZnSO_4的肉鸡（P< 0.01）。试验结果表明，在初始期（1-21天）和生长期（22-42天），胫骨锌含量与补锌水平呈显著的剂量依赖关系（P< 0.01）。在80 mg/kg ZnSO_4和60 mg/kg ZnCl_2饲料中，胰腺和胫骨锌含量最高。添加80 mg/kg ZnSO 4或Zn-Zn-B的肉鸡胸肌锌含量最高（P< 0.05）。42日龄时，胰腺、胫骨和胸肌中锌含量随补锌水平的提高而显著增加（P< 0.01）。与硫酸锌组相比，Zn-Na 2SO 4组胫骨锌含量增加（P< 0.05）。21日龄时，以胰腺、胫骨和胸肌中锌含量为响应参数，测定锌的相对生物学效价（RBVs）分别为109.64%、100%和100%。42日龄时，锌的相对效价分别为胰腺和胫骨锌含量的86.32%和119.55%。结果表明，在肉鸡日粮中，Zn-Na 2SO 4的生物利用率高于ZnSO 4。肉仔鸡锌的适宜添加量为60 mg/kg，以锌合剂的形式添加。
The aim of the present study was to evaluate the bioavailability of zinc-bearing palygorskite (Zn-Pal) in broilers. A total of 432 one-day-old Arbor Acres broilers were randomly assigned to nine groups administered different dietary treatments for 42 days. The broilers were fed a basal diet supplemented with 0, 20, 40, 60 or 80 mg/kg of Zn in the form of either feed-grade ZnSO4or Zn-Pal, respectively. The growth performance was not affected by the addition of Zn (P> 0.05). At 21 days of age, the content of Zn in the blood of broilers fed diets supplemented with Zn-Pal was higher than that of broilers fed diets supplemented with ZnSO4(P< 0.01). A dose-dependent response was observed between the supplemental Zn level and the Zn content in the tibia in both the starter (1–21 days) and grower periods (22–42 days,P< 0.01). The maximal Zn content was observed in the pancreas and tibia of broilers fed 80 mg/kg of Zn as ZnSO4or 60 mg/kg of Zn as Zn-Pal. The broilers fed 80 mg/kg of Zn as either ZnSO4or Zn-Pal had the highest Zn content in the breast muscle (P< 0.05). At 42 days of age, the contents of Zn in the pancreas, tibia and breast muscle increased with supplemental Zn levels (P< 0.01). Zn-Pal increased the Zn content in the tibia compared with ZnSO4(P< 0.05). At 21 days of age, the relative biological values (RBVs) of Zn-Pal were 109.64%, 100% and 100%, as determined using the contents of Zn in the pancreas, tibia and breast muscle, respectively, as response parameters. At 42 days of age, the RBVs of Zn-Pal were 86.32% and 119.55% based on the contents of Zn in the pancreas and tibia. It was concluded that Zn-Pal had a higher bioavailability than ZnSO4in broiler diets. The optimal level of supplemented Zn for broilers was 60 mg/kg in the form of Zn-Pal.