Table 6. AME and ileal digestibility coefficient of minerals of 24-d old broilers that consumed diets with different levels of Na with or without phytase

Na level1) Phytase2) AME (MJ/kg) N Ca P Na K Mg
Low None 14.92ab 0.75 0.47a 0.50 –0.56 0.85 0.12b
Plus 14.92ab 0.80 0.38a 0.54 −0.45 0.89 0.30a
Mid None 14.95ab 0.76 0.38a 0.46 0.05 0.89 0.16ab
Plus 14.88ab 0.79 0.33a 0.47 −0.25 0.87 0.16ab
High None 14.06c 0.71 0.16b 0.31 0.19 0.87 −0.12c
Plus 15.22a 0.78 0.39a 0.50 0.13 0.90 0.17ab
SEM 0.03 0.02 0.08 0.06 0.25 0.02 0.08
Na level
Low 14.9 0.78 0.43a 0.52a –0.50b 0.87 0.21a
Mid 14.8 0.77 0.36ab 0.47ab –0.10b 0.88 0.16ab
High 14.6 0.75 0.27b 0.41b 0.16a 0.88 0.03b
Phytase
None 14.6b 0.74b 0.37 0.43b –0.11 0.87 0.05b
Plus 14.9a 0.79a 0.34 0.51a –0.19 0.88 0.21a
Source of variation
Na ns ns * * *** ns **
Phytase * *** ns * ns ns ***
Na × phytase *** ns * ns ns ns *
Means were obtained from 6 replicates (2 birds per cage).
Means within a column without common superscript are statistically different (p < 0.05).
Low, 1.5 g Na/kg; Mid, 2.5 Na/kg; High, 3.5 g Na/kg.
None, without phytase; plus, with (500 U/kg) phytase.
p > 0.05; * p < 0.05; ** p < 0.01; *** p < 0.001.
AME, apparent metabolizable energy.