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. 2014 Feb;27(2):237–246. doi: 10.5713/ajas.2013.13370

Table 8.

Effects of phytase on Cu, Fe, Mn and Zn balance in growing pigs (Exp. 2)

Item Positive control Phytase level (FTU/kg) SEM p-value


0 500 1,000 20,000 Treat Linear Quadratic
Copper, Cu
 Intake (mg/d) 16.1 17.0 19.7 19.7 19.7
 Digestibility (%) 17.8b 18.5b 27.3a 29.3a 29.5a 2.08 <0.01 0.06 <0.01
 Retention (mg/d) 2.26b 2.54b 4.45a 4.94a 4.99a 0.44 <0.01 0.05 <0.01
 Utilization (%) 13.8b 14.7b 22.8a 24.9a 25.1a 2.31 <0.01 0.09 <0.01
Iron, Fe
 Intake (mg/d) 119.3 111.4 126.7 124.8 120.4
 Digestibility (%) 34.0 33.3 36.5 37.6 37.3 3.12 0.81 0.68 0.37
 Retention (mg/d) 39.6 36.2 45.0 45.9 43.9 3.84 0.36 0.70 0.11
 Utilization (%) 32.8 32.2 35.5 36.6 36.3 3.18 0.80 0.66 0.38
Manganese, Mn
 Intake (mg/d) 31.3 31.9 34.2 34.2 33.3
 Digestibility (%) 30.6 29.7 35.0 34.5 35.4 3.34 0.64 0.45 0.26
 Retention (mg/d) 9.5 9.2 11.9 11.6 11.6 1.06 0.24 0.49 0.09
 Utilization (%) 30.0 29.1 34.5 33.8 34.8 3.33 0.63 0.46 0.26
Zinc, Zn
 Intake (mg/d) 95.5 77.4 77.4 89.5 83.5
 Digestibility (%) 22.7b 24.6b 23.6b 23.8b 26.9ab 1.25 0.20 0.05 0.58
 Retention (mg/d) 19.8 17.2 16.5 19.5 20.6 1.09 0.05 0.02 0.17
 Utilization (%) 20.8 22.2 21.2 21.7 24.5 1.26 0.27 0.07 0.69
a–b

Means in the same row with different superscripts differ (p<0.05).