Table 4.
Effects of increasing the inclusion level of phytase on the prececal and total tract digestibility of energy, nitrogen, phosphorus, and calcium, and on the prececal and total tract InsP6 hydrolysis of corn–soybean meal-based diets fed to growing pigs, % (Exp. 1)1
| BD2 | ||||||
|---|---|---|---|---|---|---|
| Phytase: | 0 | 750 | 1,500 | 3,000 | Pooled SEM | P-value |
| Prececal | ||||||
| Dry matter | 69.8 | 69.8 | 69.1 | 69.9 | 1.0 | 0.561 |
| Energy | 73.8 | 73.5 | 72.7 | 73.3 | 0.9 | 0.319 |
| Nitrogen | 73.1 | 74.2 | 73.7 | 74.6 | 1.6 | 0.521 |
| Phosphorus | 16.3a | 50.5b | 60.5c | 61.4c | 2.1 | <0.001 |
| Calcium | 45.0a | 58.6b | 62.1b | 57.5b | 4.7 | 0.041 |
| InsP6 | 18.4a | 76.3b | 83.2c | 85.0c | 1.5 | <0.001 |
| Total tract | ||||||
| Dry matter | 86.9 | 87.2 | 87.6 | 87.1 | 0.3 | 0.090 |
| Energy | 88.1 | 87.8 | 87.9 | 87.5 | 0.3 | 0.369 |
| Nitrogen | 84.6 | 85.3 | 86.1 | 85.6 | 0.7 | 0.161 |
| Phosphorus | 22.7a | 48.8b | 58.7b | 53.9b | 4.4 | <0.001 |
| Calcium | 36.0a | 49.5b | 59.9b | 46.8ab | 5.3 | 0.019 |
| InsP6 | 96.6 | 97.5 | 98.6 | 97.4 | 0.7 | 0.102 |
1Data are given as LSMeans and pooled SEM (untransformed data).
2Corn–soybean meal-based basal diet.
a–cWithin a row, means without a common superscript differ (P < 0.05).