Table 6.
Effects of graded levels of phytase supplementation on excreta trace elements content in Pekin ducks fed phosphorus-deficient diets.
| Item | Positive Control (PC) | Negative control (NC) with phytase supplementation FTU/kg) |
SEM |
P-value |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 500 | 2,500 | 5,000 | 7,500 | 10,000 | ANOVA | Linear | Quadratic | |||
| Zn (mg/kg) | 685.0a | 604.2b | 697.0a | 632.7a,b | 686.6a | 671.1a | 673.2a | 55.80 | 0.0347 | 0.0548 | 0.250 |
| Mn (mg/kg) | 581.1c | 590.1c | 597.6c | 669.2b | 723.3a | 695.9a,b | 710.3a,b | 38.29 | <0.0001 | <0.0001 | 0.612 |
| Cu (mg/kg) | 42.87b,c | 30.99d | 37.49c | 41.69b,c | 46.31a,b | 48.95a | 50.94a | 4.75 | <0.0001 | <0.0001 | 0.077 |
| Fe (mg/kg) | 806.4d | 1110.7c | 1264.2b,c | 1363.7b | 1599.6a | 1706.3a | 1696.1a | 195.09 | <0.0001 | 0.0012 | 0.528 |
a–dMeans within column and under each main effect with no common superscript differ significantly (P < 0.05).
Abbreviations: ANOVA, analysis of variance; Cu, copper; Fe; iron; Mn, manganese; Zn, zinc.