Table 4.
Effects of dietary protease supplementation on standardized ileal digestibility (%) of the protein and amino acids of soybean meal fed to growing-finishing pigs (23 to 30 kg/90 d old), phase I
| Item | Protease inclusion, g/ton | SEM | P-value | |||||
|---|---|---|---|---|---|---|---|---|
| 0 | 25 | 50 | 75 | Linear | Quadratic | CON vs. protease1 | ||
| CP | 82.6 | 83.1 | 88.5 | 84.0 | 3.68 | 0.63 | 0.58 | 0.61 |
| Indispensable AA | ||||||||
| Arg | 88.5 | 88.4 | 88.2 | 90.1 | 3.23 | 0.73 | 0.75 | 0.90 |
| His | 86.4 | 87.8 | 88.8 | 89.8 | 1.61 | 0.16 | 0.92 | 0.24 |
| Ile | 84.2 | 86.4 | 88.1 | 88.0 | 1.41 | 0.06 | 0.43 | 0.06 |
| Leu | 81.9 | 83.9 | 86.2 | 85.8 | 1.46 | 0.04 | 0.40 | 0.05 |
| Lys | 82.0 | 86.5 | 86.7 | 88.2 | 1.96 | 0.03 | 0.42 | 0.02 |
| Met | 87.0 | 88.6 | 92.0 | 91.9 | 1.82 | 0.03 | 0.63 | 0.07 |
| Met + Cys | 74.7 | 77.1 | 82.1 | 78.6 | 2.37 | 0.13 | 0.23 | 0.11 |
| Phe | 83.9 | 85.8 | 88 | 87.5 | 1.43 | 0.05 | 0.41 | 0.06 |
| Thr | 75.4 | 80.1 | 85.3 | 83.3 | 2.64 | 0.03 | 0.25 | 0.03 |
| Trp | 90.5 | 91.6 | 90.3 | 91.1 | 1.61 | 0.93 | 0.94 | 0.78 |
| Val | 79.0 | 81.4 | 83.1 | 82.7 | 1.70 | 0.09 | 0.40 | 0.08 |
| Mean | 83.4 | 85.5 | 87.1 | 87.3 | 1.59 | 0.08 | 0.56 | 0.10 |
| Dispensable AA | ||||||||
| Ala | 64.1 | 65.4 | 65.7 | 69.2 | 3.30 | 0.30 | 0.74 | 0.50 |
| Asp | 79.9 | 82.5 | 84.7 | 84.8 | 1.64 | 0.03 | 0.44 | 0.03 |
| Cys | 62.5 | 62.5 | 72.2 | 65.4 | 3.16 | 0.29 | 0.13 | 0.16 |
| Glu | 88.5 | 90.0 | 91.7 | 90.7 | 1.81 | 0.27 | 0.47 | 0.24 |
| Gly | 22.9 | 17.9 | 25.3 | 30.0 | 7.94 | 0.40 | 0.52 | 0.86 |
| Ser | 79.0 | 78.2 | 82.6 | 81.7 | 2.04 | 0.16 | 0.99 | 0.41 |
| Tyr | 84.2 | 85.6 | 90.6 | 87.9 | 1.99 | 0.11 | 0.34 | 0.12 |
| Mean | 73.1 | 73.9 | 77.1 | 76.7 | 2.43 | 0.22 | 0.81 | 0.34 |
| Total AA mean | 69.8 | 70.2 | 72.1 | 74.3 | 3.15 | 0.24 | 0.76 | 0.47 |
1Contrast: control diet (without protease supplementation) vs. protease supplementation (25 to 75 g/ton). Each dietary treatment had 10 observations.