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Organic zinc absorption by the intestine of broilers in vivo

  • Yu Yu (a1) (a2), Lin Lu (a1), Su-Fen Li (a1) (a3), Li-Yang Zhang (a1) and Xu-Gang Luo (a1)...

Abstract

In Expt 1, a Zn-unsupplemented basal diet (control) and the basal diet supplemented with one of four different Zn sources, including ZnSO4, Zn-amino acid chelate with a weak chelation strength (Zn-AA W), Zn-protein chelate with a moderate chelation strength (Zn-Pro M) and Zn-protein chelate with a strong chelation strength (Zn-Pro S) were fed to broiler chickens from days 14 to 28. On day 28, Zn content in plasma from the hepatic portal vein increased (P<0·05) in the following order: control<ZnSO4<Zn-AA W<Zn-Pro M<Zn-Pro S. Meanwhile, metallothionein (MT) mRNA levels in the duodenum, jejunum and ileum were enhanced (P<0·05) by Zn addition regardless of Zn source. However, no differences among different Zn sources were observed. In Expt 2, ligated duodenal loops from Zn-deficient broilers (28-d old) were perfused with solutions containing 0–2·464 mmol Zn/l from the above-mentioned four Zn sources for up to 30 min. The uptake kinetics of Zn followed a saturable carrier-mediated process. The maximum absorption velocity values were in the following order: control<ZnSO4<Zn-AA W<Zn-Pro M<Zn-Pro S. Moreover, MT mRNA levels for Zn-Pro S (P<0·03), Zn-Pro M (P>0·05) and Zn-AA W(P<0·04) were higher than those for ZnSO4. These findings indicate that organic Zn absorption (especially Zn-Pro S) in intact living broilers was more effective than that of inorganic Zn; organic Zn absorption in the ligated duodenal segment was a saturable carrier-mediated process similar to that of ZnSO4. Moreover, except for MT, there might be other Zn transporters involved in Zn absorption that are affected by different Zn sources.

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Corresponding author

* Corresponding author: Professor X.-G. Luo, fax +86 10 6281 0184, email wlysz@263.net

References

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Keywords

Organic zinc absorption by the intestine of broilers in vivo

  • Yu Yu (a1) (a2), Lin Lu (a1), Su-Fen Li (a1) (a3), Li-Yang Zhang (a1) and Xu-Gang Luo (a1)...

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