Table 4. Effects of dietary crude protein level and protease supplementation on the apparent total tract digestibility of nutrients in growing pigs.
| Items | HP | LP | SE | p-value | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| PT 0 | PT 150 | PT 300 | PT 0 | PT 150 | PT 300 | CP | Protease | CP* × protease | ||
| Dry matter | 81.81 | 82.10 | 81.29 | 81.44 | 81.03 | 81.51 | 0.22 | 0.386 | 0.919 | 0.536 |
| Digestible energy | 72.90a | 74.47ab | 75.97b | 74.08a | 74.40ab | 76.21b | 0.35 | 0.485 | 0.008 | 0.708 |
| Metabolic energy | 71.52a | 73.46ab | 74.93b | 72.60a | 73.23ab | 75.09b | 0.34 | 0.549 | 0.001 | 0.625 |
Each value is the mean value of 6 replicates (1 pig/cage; 6 × 6 latin square).
a,b
Means in the same row with different superscripts differ (p <0.05).
HP, high crude protein (17.3%); LP, low crude protein (15.1%); PT, protease (ppm); CP, crude protein.