Table 2. Effect of energy level and dietary beet pulp on growth performance of growing-finishing pigs under heat stress conditions.
| Temperature (T) | TN | HS | SEM | p-value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ME (kcal/kg) (E) | 3,300 | 3,300 | 3,450 | 3,300 | HS | ||||||||
| Fiber level (F) | Low | High | Low | High | Low | High | T | F | T × F | E | F | E × F | |
| BW (kg) | |||||||||||||
| Initial | 56.43 | 57.27 | 56.80 | 56.48 | 56.44 | 56.59 | 0.38 | 0.428 | 0.526 | 0.263 | 0.730 | 0.778 | 0.532 |
| Final | 116.3 | 116.6 | 99.4 | 101.9 | 100.5 | 102.7 | 1.31 | < 0.001 | 0.333 | 0.243 | 0.438 | 0.069 | 0.905 |
| Phase 1 (d 0–28) | |||||||||||||
| ADG (g) | 1,169 | 1,122 | 767 | 808 | 775 | 833 | 28.97 | < 0.001 | 0.895 | 0.048 | 0.568 | 0.410 | 0.751 |
| ADFI (g) | 2,223 | 2,189 | 1,755 | 1,767 | 1,739 | 1,712 | 61.68 | < 0.001 | 0.728 | 0.489 | 0.635 | 0.916 | 0.796 |
| G:F | 0.526 | 0.513 | 0.437 | 0.457 | 0.448 | 0.501 | 0.02 | < 0.001 | 0.777 | 0.147 | 0.272 | 0.154 | 0.493 |
| Phase 2 (d 29–56) | |||||||||||||
| ADG (g) | 968 | 975 | 754 | 819 | 800 | 816 | 37.9 | < 0.001 | 0.349 | 0.452 | 0.477 | 0.186 | 0.413 |
| ADFI (g) | 3,295 | 3,213 | 2,331 | 2,317 | 2,344 | 2,221 | 126.3 | < 0.001 | 0.657 | 0.756 | 0.770 | 0.628 | 0.701 |
| G:F | 0.294 | 0.303 | 0.323 | 0.353 | 0.351 | 0.388 | 0.03 | 0.015 | 0.335 | 0.685 | 0.405 | 0.306 | 0.824 |
| Overall (d 0–56) | |||||||||||||
| ADG (g) | 1,069 | 1,049 | 761 | 814 | 788 | 825 | 22.6 | < 0.001 | 0.437 | 0.081 | 0.364 | 0.049 | 0.734 |
| ADFI (g) | 2,759 | 2,701 | 2,043 | 2,042 | 2,041 | 1,967 | 64.28 | < 0.001 | 0.576 | 0.592 | 0.598 | 0.601 | 0.614 |
| G:F | 0.387 | 0.388 | 0.372 | 0.398 | 0.389 | 0.423 | 0.01 | 0.912 | 0.208 | 0.244 | 0.197 | 0.080 | 0.797 |
TN, thermoneutral (21°C–24°C); HS, heat stress (30~34°C); ME, metabolizable energy; BW, body weight; ADG, average daily gain; ADFI, average daily feed intake; G:F, gain to feed intake ratio.