Table 7.
Effect of sodium sources and phytase supplementation on apparent nutrient and energy utilization in 21-day-old broiler chickens (%).1
| Treatment | Dry matter | Nitrogen | Phosphorus | Calcium | Energy | AME2, kcal/kg | AMEn2, Kcal/kg | ||
|---|---|---|---|---|---|---|---|---|---|
| Positive control (PC) | 75.0* | 71.0* | 62.0* | 30.0 | 78.0* | 3,461* | 3,367* | ||
| Sodium | Phytase | ||||||||
| NaCl | 75.6 | 69.1 | 55.0 | 38.2 | 78.4 | 3,492 | 3,395 | ||
| NaCl + NaHCO3 | 75.7 | 71.5 | 54.1 | 33.1 | 78.5 | 3,494 | 3,404 | ||
| 0 | 75.1 | 68.7 | 48.5 | 29.5 | 78.0 | 3,472 | 3,374 | ||
| 500 | 75.8 | 70.4 | 54.3 | 33.5 | 78.4 | 3,492 | 3,398 | ||
| 1,000 | 75.3 | 70.4 | 56.6 | 37.0 | 78.2 | 3,480 | 3,385 | ||
| 2,000 | 76.5 | 71.8 | 58.8 | 42.6 | 79.3 | 3,528 | 3,439 | ||
| NaCl | 0 | 74.9* | 67.5 | 50.0 | 35.7 | 77.8 | 3,465* | 3,363* | |
| NaCl | 500 | 75.5 | 68.2* | 56.0 | 39.7 | 78.1 | 3,481* | 3,380* | |
| NaCl | 1,000 | 75.1* | 69.9 | 55.2* | 33.6 | 78.1 | 3,479* | 3,382* | |
| NaCl | 2,000 | 76.8 | 70.8* | 58.8 | 43.8* | 79.6 | 3,544 | 3,454 | |
| NaCl + NaHCO3 | 0 | 75.3* | 69.9 | 47.0 | 23.3 | 78.2 | 3,480* | 3,386* | |
| NaCl + NaHCO3 | 500 | 76.0* | 72.5* | 52.5* | 27.4* | 78.7 | 3,503* | 3,417* | |
| NaCl + NaHCO3 | 1,000 | 75.5 | 70.9 | 58.0 | 40.4* | 78.3 | 3,481 | 3,388 | |
| NaCl + NaHCO3 | 2,000 | 76.3 | 72.8 | 58.9* | 41.5 | 79.0 | 3,512 | 3,425 | |
| SD3 | 0.76 | 2.23 | 2.32 | 5.35 | 0.69 | 30.09 | 36.25 | ||
| Probability | |||||||||
| Contrast | PC vs. 0 Phy4 | 0.999 | 0.118 | 0.121 | 0.855 | 0.254 | 0.137 | 0.715 | |
| Trend for main effect | |||||||||
| Linear | Phytase | <0.001 | 0.005 | <0.001 | <0.001 | <0.001 | 0.002 | 0.002 | |
| Quadratic | Phytase | 0.365 | 0.607 | <0.001 | 0.679 | 0.229 | 0.246 | 0.305 | |
| Trend for simple effect | |||||||||
| Linear | NaCl + Phytase | - | - | <0.001 | 0.123 | - | - | - | |
| Quadratic | NaCl + Phytase | - | - | <0.001 | 0.587 | - | - | - | |
| Linear | NaHCO3 + Phytase | - | - | <0.001 | <0.001 | - | - | - | |
| Quadratic | NaHCO3 + Phytase | - | - | 0.010 | 0.184 | - | - | - | |
| Sodium | 0.467 | 0.001 | 0.204 | 0.003 | 0.458 | 0.849 | 0.424 | ||
| Phytase | <0.001 | 0.019 | <0.001 | <0.001 | 0.001 | 0.001 | 0.001 | ||
| Sodium × phytase | 0.376 | 0.361 | 0.011 | <0.001 | 0.173 | 0.177 | 0.182 | ||
1
Means represents 6 replicate cages except for values with an asterisk (*) where n was 5 per treatment.
2
Apparent metabolizable energy; Apparent metabolizable energy corrected for nitrogen.
3
Standard deviation.
4
Contrast between the positive control and diets containing 0 FTU phytase/kg diet.