Table 7. Effect of Na on total tract retention of nitrogen (N) and minerals of 24-d old broilers fed diet with or without phytase
Na level1) | Phytase2) | N | Ca | P | Mg | Na | K |
Low | None | 0.65ab | 0.60a | 0.56b | 0.25a | 0.64b | 0.35b |
| Plus | 0.67a | 0.58a | 0.62a | 0.29a | 0.73a | 0.42a |
Mid | None | 0.61b | 0.50b | 0.49c | 0.18a | 0.41d | 0.28c |
| Plus | 0.65ab | 0.56a | 0.55b | 0.21a | 0.47c | 0.29bc |
High | None | 0.50c | 0.27c | 0.28d | –0.13b | 0.09f | 0.09d |
| Plus | 0.67a | 0.60a | 0.63a | 0.26a | 0.35e | 0.35b |
SEM | | 0.05 | 0.03 | 0.02 | 0.06 | 0.02 | 0.03 |
Main effects |
Na level | | 0.65a | 0.59a | 0.59a | 0.27a | 0.68a | 0.39a |
Low | | 0.63a | 0.53b | 0.52b | 0.20a | 0.44b | 0.25b |
Mid | | 0.59b | 0.44c | 0.46c | 0.08b | 0.22c | 0.22c |
High | | | | | | | |
| Phytase | | | | | | |
| None | 0.58b | 0.46b | 0.44b | 0.10b | 0.38b | 0.24b |
| Plus | 0.66a | 0.58a | 0.60a | 0.26a | 0.52a | 0.35a |
Source of variation |
Na | | *** | *** | *** | *** | *** | *** |
Phytase | | *** | *** | *** | *** | *** | *** |
Na × phytase | | *** | *** | *** | *** | *** | *** |
Means were obtained from 6 replicates (7 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 < 0.001.