Table 4.
Effect of feeding different amounts of NPP and phytase on eggshell strength, tibia strength, and mineral fraction1.
| Eggshell resistance to fracture (RF) | Tibia | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Dietary | Inorganic | Phytase | |||||||
| NPP | P addition | addition | wk 0 | wk 4 | RF | Ca | P | Ash | |
| Treatment | % | % | FYT/kg | g | g | g | % | % | % |
| 1 | 0.12 | 0.00 | 0.0 | 3,286 | 3,628 | 17,251c | 14.3c | 6.2c | 38.1c |
| 2 | 0.23 | 0.11 | 0.0 | 3,741 | 3,809 | 20,850a,b | 15.2b,c | 7.1b,c | 41.8b |
| 3 | 0.34 | 0.22 | 0.0 | 3,674 | 3,854 | 23,448a | 16.9a | 8.8a | 45.4a |
| 4 | 0.12 | 0.00 | 300 | 3,468 | 3,546 | 19,782b,c | 15.1b,c | 7.3b | 42.2b |
| 5 | 0.12 | 0.00 | 600 | 3,411 | 3,580 | 21,776a,b | 15.7a,b | 7.8a,b | 43.2a,b |
| 6 | 0.12 | 0.00 | 1,200 | 3,693 | 3,421 | 23,346a | 16.1a,b | 8.0a,b | 44.3a,b |
| 7 | 0.12 | 0.00 | 1,800 | 3,804 | 3,624 | 23,283a | 15.9a,b | 8.5a | 45.6a |
| SEM | 152.04 | 130.9 | 1,106.6 | 0.05 | 0.39 | 1.14 | |||
| P < | 0.18 | 0.28 | 0.003 | 0.03 | 0.002 | 0.001 | |||
1Numbers with distinct letter per column were statistically different (P < 0.05).