Table 4. Effects of crude protein level with protease supplementation level on growth performance 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 |
Body weight (kg) |
Initial | 7.0 | 7.0 | 7.0 | 7.0 | 7.0 | 0.1 | 0.688 | 0.977 | 0.997 |
4 wk | 15.7 | 15.7 | 15.3a | 15.4a | 16.5b | 0.2 | 0.944 | 0.010 | 0.941 |
8 wk | 32.2 | 32.3 | 31.9 | 32.0 | 32.8 | 0.4 | 0.875 | 0.695 | 0.803 |
12 wk | 57.8 | 57.1 | 57.6 | 56.8 | 58.0 | 0.7 | 0.662 | 0.786 | 0.706 |
16 wk | 88.4 | 88.4 | 88.4 | 88.1 | 88.6 | 0.9 | 0.980 | 0.974 | 0.958 |
20 wk | 114.2 | 113.6 | 111.9a | 113.2ab | 116.6b | 0.8 | 0.730 | 0.049 | 0.987 |
Weeks 0–4 |
ADG (g) | 310 | 313 | 296a | 300a | 340b | 6 | 0.779 | 0.003 | 0.917 |
ADFI (g) | 435 | 428 | 420 | 421 | 453 | 7 | 0.592 | 0.082 | 0.895 |
G/F | 0.71 | 0.73 | 0.70a | 0.71a | 0.75b | 0.01 | 0.168 | 0.011 | 0.981 |
Weeks 4–8 |
ADG (g) | 587 | 592 | 594 | 594 | 581 | 12 | 0.860 | 0.885 | 0.785 |
ADFI (g) | 1,130 | 1,147 | 1,161 | 1,159 | 1,096 | 25 | 0.753 | 0.517 | 0.793 |
G/F | 0.52 | 0.52 | 0.51 | 0.52 | 0.53 | 0.01 | 0.890 | 0.615 | 0.958 |
Weeks 8–12 |
ADG (g) | 914 | 887 | 917 | 885 | 900 | 19 | 0.483 | 0.802 | 0.293 |
ADFI (g) | 2,104 | 2,124 | 2,164 | 2,113 | 2,066 | 34 | 0.779 | 0.519 | 0.411 |
G/F | 0.44 | 0.42 | 0.42 | 0.42 | 0.44 | 0.01 | 0.248 | 0.515 | 0.677 |
Weeks 12–16 |
ADG (g) | 1,094 | 1,115 | 1,101 | 1,118 | 1,095 | 24 | 0.679 | 0.926 | 0.790 |
ADFI (g) | 2,867 | 2,927 | 2,914 | 2,891 | 2,886 | 35 | 0.406 | 0.941 | 0.607 |
G/F | 0.38 | 0.38 | 0.38 | 0.39 | 0.38 | 0.01 | 0.855 | 0.861 | 0.889 |
Weeks 16–20 |
ADG (g) | 921 | 903 | 840a | 799a | 1,000b | 15 | 0.472 | < 0.001 | 0.667 |
ADFI (g) | 3,140 | 3,016 | 2,997 | 3,081 | 3,157 | 33 | 0.062 | 0.141 | 0.974 |
G/F | 0.29 | 0.30 | 0.28a | 0.29a | 0.32b | 0.01 | 0.534 | 0.011 | 0.846 |
Weeks 0–8 |
ADG (g) | 449 | 453 | 445 | 447 | 460 | 7 | 0.813 | 0.673 | 0.773 |
ADFI (g) | 783 | 787 | 790 | 790 | 775 | 13 | 0.867 | 0.868 | 0.748 |
G/F | 0.58 | 0.58 | 0.57 | 0.57 | 0.60 | 0.01 | 0.886 | 0.134 | 0.989 |
Weeks 8–16 |
ADG (g) | 1,004 | 1,001 | 1,009 | 1,002 | 997 | 13 | 0.898 | 0.940 | 0.746 |
ADFI (g) | 2,486 | 2,525 | 2,539 | 2,502 | 2,476 | 22 | 0.377 | 0.512 | 0.314 |
G/F | 0.40 | 0.58 | 0.40 | 0.40 | 0.40 | 0.01 | 0.426 | 0.888 | 0.868 |
Weeks 0–20 |
ADG (g) | 806 | 802 | 789a | 799ab | 824b | 6 | 0.750 | 0.044 | 0.987 |
ADFI (g) | 1,935 | 1,928 | 1,931 | 1,933 | 1,932 | 10 | 0.744 | 0.997 | 0.697 |
G/F | 0.42 | 0.42 | 0.41a | 0.41ab | 0.43b | 0.01 | 0.889 | 0.049 | 0.843 |
Each value is the mean value of 4 replicates (4 pigs/pen).
Means in the same row with different superscripts differ (p < 0.05).
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; ADG, average daily gain; ADFI, average daily feed intake; G/F, feed efficiency.