Table 4.
Effect of glycine on the intestinal morphology of heat-stressed broilers.
| Effect of glycine under HT |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Treatments1 |
CON vs. HT |
P value |
||||||||
| Items | CON | HT | 0.5%Gly | 1.0%Gly | 2.0%Gly | SEM | P value | Main effect | Linear | Quadratic |
| Duodenum | ||||||||||
| VH (μm) | 1596.93 | 1462.05 | 1699.39 | 1726.31 | 1676.52 | 17.57 | 0.024 | <0.001 | <0.001 | <0.001 |
| CD (μm) | 226.65 | 287.37 | 244.87 | 244.94 | 269.60 | 8.24 | 0.007 | 0.042 | 0.659 | 0.007 |
| V/C | 7.45 | 5.36 | 7.15 | 7.22 | 7.01 | 0.26 | 0.006 | 0.030 | 0.028 | 0.048 |
| Jejunum | ||||||||||
| VH (μm) | 1726.71 | 1483.55 | 1524.76 | 1594.36 | 1631.81 | 14.63 | <0.001 | 0.001 | <0.001 | 0.976 |
| CD (μm) | 190.83 | 215.54 | 209.68 | 196.52 | 231.93 | 6.12 | 0.210 | 0.271 | 0.509 | 0.093 |
| V/C | 9.55 | 7.25 | 6.97 | 8.03 | 7.25 | 0.24 | 0.014 | 0.703 | 0.613 | 0.599 |
| Ileum | ||||||||||
| VH (μm) | 1351.33 | 1113.69 | 1222.46 | 1219.59 | 1273.03 | 13.80 | <0.001 | <0.001 | <0.001 | 0.218 |
| CD (μm) | 165.46 | 175.44 | 176.78 | 157.71 | 164.85 | 3.93 | 0.655 | 0.242 | 0.134 | 0.735 |
| V/C | 8.12 | 6.56 | 7.47 | 7.98 | 7.27 | 0.24 | 0.010 | 0.284 | 0.213 | 0.087 |
Abbreviations: CD, crypt depth; V/C, villus height: crypt depth ratio; VH, villus height.
1
CON: basal diet and raised under thermoneutral conditions; HT: basal diet and raised under cyclic high-temperature conditions; 0.5% Gly, 1.0% Gly, 2.0% Gly: basal diet supplemented with 0.5%, 1.0%, 2.0% glycine under cyclic high-temperature conditions (n = 6).