Table 5.
Effect of dietary tryptophan supplementation on intestinal morphology.
| Item | Dietary L-tryptophan (%) | ||||
|---|---|---|---|---|---|
| ZTS | LTS | HTS | SEM | P value | |
| Duodenum | |||||
| Villus height (μm) | 384.79 | 386.67 | 428.00 | 9.90 | 0.15 |
| Crypt depth (μm) | 126.09 | 134.39 | 152.00 | 7.98 | 0.44 |
| VH/CD | 3.09 | 3.08 | 2.95 | 0.14 | 0.90 |
| Goblet cell (unit) | 20.00 | 24.57 | 19.33 | 1.57 | 0.22 |
| Lymphocyte count (unit) | 259.88 | 243.29 | 241.17 | 9.15 | 0.46 |
| Jejunum | |||||
| Villus height (μm) | 350.99 | 299.48 | 336.06 | 12.34 | 0.22 |
| Crypt depth (μm) | 116.20b | 103.29b | 152.44a | 7.80 | 0.02 |
| VH/CD | 3.11a | 2.98a | 2.27b | 0.12 | 0.004 |
| Goblet cell (unit) | 10.75 | 14.75 | 11.13 | 1.04 | 0.142 |
| Lymphocyte count (unit) | 281.13 | 302.13 | 296.38 | 8.20 | 0.34 |
| Ileum | |||||
| Villus height (μm) | 266.96 | 309.95 | 300.11 | 8.72 | 0.1 |
| Crypt depth (μm) | 106.77 | 104.78 | 138.73 | 7.48 | 0.12 |
| VH/CD | 2.701ab | 3.12a | 2.25b | 0.14 | 0.09 |
| Goblet cell (unit) | 23.71 | 20.13 | 17.29 | 2.03 | 0.24 |
| Lymphocyte count (unit) | 257.57 | 304.25 | 299 | 11.07 | 0.1 |
a,bValues with different letters within the same row are different (P < 0.05).
ZTS: zero Trp supplementation (0% Trp); LTS: low Trp supplementation (0.15% Trp); HTS: high Trp supplementation (0.75% Trp).