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The plasma concentration of zinc (A), copper (B), iron (C), calcium (D), phosphorus (E), and Ca/P ratio (F) in 42-day-old chickens in control groups and supplemented with organic Zn in 25% of recommended dose with or without phytase inclusion. Data given are LSMeans ± SEM; a, b–values with different letters differ significantly at P<0.05. The description of the groups as in the Fig 1.
