Table 5.
Model calculation of the lysine requirement (Lys) for growing pigs (Sire line 337 × Dan line Camborough, PIC) challenged with E. coli lipopolysaccharide2, depending on the determined efficiency of lysine utilization and different predictions for feed intake
| Item | Control | Challenged | ||
|---|---|---|---|---|
| NDmaxT1, mg/ BWkg0.75/ d | 3,524.7 | 2,077.8 | ||
| NDmaxT, % | 68 | 54 | ||
| Protein deposition, g/d | 136 | 64 | ||
| Lys efficiency, bc-1 | 0.00003703 | 0.00005713 | ||
| Lys requirement, mg/ BWkg0.75/d | 1,994.83 | 949.16 | ||
| Lys requirement, g/d | 18.12 | 8.62 | ||
| Optimal dietary lysine concentration | ||||
| Feed intake3 g/d | Digestible Lys, % | Feed intake3 g/d | Digestible Lys, % | |
| 1,100 | 1.29 | 981 | 0.69 | |
| 1,000 | 1.42 | 893 | 0.76 | |
| 900 | 1.58 | 803 | 0.84 | |
| 800 | 1.77 | 714 | 0.94 |
1NDmaxT is the theoretical maximum nitrogen deposition.
2 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).
3The feed intake was calculated based on the recommendations of Rostagno et al. (2017) for pigs of 20 kg. Feed intake was adjusted for the challenged group, considering the 10.73% reduction in feed intake.