Table 3. Effects of dietary crude protein levels and cysteamine (CS) supplementation on growth performance and carcass traits of finishing pigs.
| Item | Normal protein | Low protein | P value | ||||
|---|---|---|---|---|---|---|---|
| Control | Cysteamine | Control | Cysteamine | P | CS | P × CS | |
| Initial BW (kg) | 65.87±1.66 | 65.83±1.21 | 65.81±1.49 | 65.87±0.75 | 0.992 | 0.992 | 0.972 |
| Final BW (kg) | 94.45±1.88 | 96.72±1.37 | 93.98±1.74 | 96.13±1.01 | 0.736 | 0.171 | 0.971 |
| ADG (g/d) | 697.17±13.88 | 753.26±8.14 | 687.15±10.26 | 738.15±7.14 | 0.236 | <0.001 | 0.806 |
| ADFI (kg/d) | 2.53±0.04 | 2.54±0.12 | 2.55±0.08 | 2.46±0.14 | 0.767 | 0.731 | 0.614 |
| FCR (kg/kg) | 3.63±0.07 | 3.37±0.15 | 3.71±0.09 | 3.33±0.18 | 0.896 | 0.028 | 0.634 |
| Dressing percentage (%) | 68.56±0.53 | 68.44±0.29 | 69.60±1.31 | 69.73±0.53 | 0.149 | 0.993 | 0.873 |
| Back fat (cm) | 2.60±0.07 | 2.29±0.14 | 2.68±0.10 | 2.39±0.10 | 0.426 | 0.013 | 0.904 |
| Loin eye area (cm 2 ) | 43.90±0.91 | 46.10±1.50 | 42.20±2.56 | 44.43±1.29 | 0.331 | 0.206 | 0.993 |
| Lean percentage (%) | 59.24±1.39 | 62.32±1.24 | 57.98±0.61 | 59.58±0.65 | 0.071 | 0.038 | 0.484 |
BW, body weight; ADG, average daily weight gain; ADFI, average daily feed intake; FCR = feed conversion ratio. Values are means ± SEM. Values within a row with different letters differ (P<0.05). All traits in this table were analysed with pen as the experimental unit (n = 5); P, main effect of dietary protein levels; CS, main effect of cysteamine supplementation; P×CS, interaction between main effects of dietary protein levels and cysteamine supplementation.