Table 5. Effects of crude protein level and supplementation protease level on digestibility of nutrients in weaned piglets and growing-finishing pigs
Item | Main effects | SE | p-value |
Protein level | Protease level | CP | Protease | CP × protease |
HP | LP | PT0 | PT1 | PT2 |
Week 4 |
DM | 78.58 | 78.58 | 78.98 | 78.64 | 78.12 | 0.26 | 0.992 | 0.453 | 0.734 |
CP | 72.42 | 74.21 | 73.53 | 73.76 | 72.66 | 0.36 | 0.013 | 0.362 | 0.794 |
Week 12 |
DM | 80.66 | 81.24 | 81.17 | 81.01 | 80.66 | 0.17 | 0.095 | 0.440 | 0.661 |
CP | 75.95 | 77.45 | 76.51 | 76.88 | 76.71 | 0.29 | 0.014 | 0.858 | 0.938 |
Week 20 |
DM | 82.63 | 82.77 | 82.63 | 83.00 | 82.48 | 0.16 | 0.664 | 0.432 | 0.736 |
CP | 79.15 | 80.69 | 79.79 | 80.41 | 79.56 | 0.37 | 0.035 | 0.575 | 0.295 |
Each value is the mean value of 4 replicates (4 pigs/pen).
HP, high crude protein (19.00% [days 1–14 phase], 18.05% [days 15–28 phase], 17.10% [growing phase] and 16.15% [finishing phase]); LP, low crude protein (17.00% [days 1–14], 16.15% [days 15–28], 15.30% [growing phase] and 14.45% [finishing phase]); PT0, protease 0 ppm (weanling-finishing phase); PT1, protease 300 ppm (weanling phase) and 150 ppm (growing-finishing phase); PT2, protease 500 ppm (weanling phase) and 300 ppm (growing-finishing phase) ; CP, crude protein; DM, dry matter.