Table 4.
Average of feed intake (g/d) body weight (kg), nitrogen intake (mg/BWkg0.75/d), nitrogen excretion (mg/BWkg0.75/d), and nitrogen deposition (mg/BWkg0.75/d) obtained in nitrogen balance trials for growing pigs challenged with E. coli lipopolysaccharide1
| Nitrogen levels, % N as fed basis | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Variables measured | 0.94 | 1.69 | 2.09 | 3.04 | 3.23 | 3.97 | Average | SEM | Linear | Quadratic |
| Feed Intake1 | ||||||||||
| Control | 411.9 | 417.2 | 419.1 | 418.8 | 413.3 | 426.6 | 417.8 | 9.70 | 0.532 | 0.917 |
| Challenged | 373.5 | 375.0 | 384.5 | 370.6 | 362.7 | 371.6 | 373.0 | 9.70 | 0.533 | 0.754 |
| Body Weight 2 | ||||||||||
| Control | 19.6 | 19.3 | 18.7 | 18.7 | 18.4 | 19.2 | 19.0 | 0.66 | 0.409 | 0.272 |
| Challenged | 19.4 | 19.0 | 18.8 | 18.7 | 18.7 | 19.1 | 18.9 | 0.66 | 0.272 | 0.661 |
| Nitrogen Intake 3,4 | ||||||||||
| Control | 519.7 | 958.5 | 1,216.0 | 1,773.3 | 1,883.0 | 2,309.7 | 1,443.3 | 24.82 | <0.001 | 0.029 |
| Challenged | 473.2 | 871.2 | 1,111.0 | 1,569.7 | 1,628.5 | 1,976.0 | 1,271.6 | 24.82 | <0.001 | 0.001 |
| P-value | 0.306 | 0.057 | 0.023 | <0.001 | <0.001 | <0.001 | ||||
| Nitrogen Excretion 3,4 | ||||||||||
| Control | 184.1 | 309.3 | 407.3 | 545.9 | 483.9 | 783.2 | 452.3 | 36.23 | <0.001 | 0.683 |
| Challenged | 246.0 | 369.5 | 478.2 | 626.7 | 848.6 | 884.9 | 575.6 | 36.23 | <0.001 | 0.474 |
| P-value | 0.249 | 0.262 | 0.188 | 0.135 | <0.001 | 0.061 | ||||
| Nitrogen Deposition 3,4 | ||||||||||
| Control | 335.6 | 649.2 | 808.6 | 1,227.3 | 1,405.9 | 1,526.5 | 992.2 | 42.13 | <0.001 | 0.028 |
| Challenged | 227.2 | 501.7 | 632.8 | 943.1 | 771.4 | 1091.1 | 694.6 | 42.13 | <0.001 | <0.001 |
| P_value | 0.079 | 0.018 | 0.005 | <0.001 | <0.001 | <0.001 |
1Effect of challenge (P < 0.01), E. coli lipopolysaccharide (LPS) was used to induce inflammatory response in challenged group. The challenge consisted of an initial LPS dose of 30 μg/kg IM and subsequent dose of 33.6 μg/kg IM after 48 h. The control group received saline solution (0.9%, IM).
2Body weightbefore samplingperiod.
3Effect of N levels × challenge status interaction (P < 0.05).
4Polynomial contrasts: Linear effect of N levels (P < 0.01): NI, control NI = 215.13 + 350.91 NL and challenged NI = 246.87 + 292.80 NL (mg/BWkg0.75/d); NEX, control NEX = 86.27 + 104.54 NL and challenged NEX = 97.27 + 136.69 NL (mg/BWkg0.75/d); ND, control ND = 127.86 + 246.95 NL and challenged ND = 150.66 + 155.40 NL (mg/BWkg0.75/d).