Table 9.
Main and simple effects of coccidia vaccine challenge (CVC) and exogenous enzyme supplementation on ileal villi height (VH), crypt depth (CD), and height-to-crypt-depth ratio (VH:CD) in 21-day old broiler chickens (7-day post-challenge).
| CVC | Enzyme | Corn-Soybean Meal-Based Diet 1 | Wheat-Corn-Soybean Meal-Based Diet 2 | |||||
|---|---|---|---|---|---|---|---|---|
| Villi Height, µm | Crypt Depth, µm | VH:CD | Villi Height, µm | Crypt Depth, µm | VH:CD | |||
| Means for Main Effect of CVC | ||||||||
| − | 755.5 | 132.0 | 5.857 | 772.8 | 137.8 | 5.814 | ||
| + | 662.8 | 178.4 | 3.901 | 682.0 | 173.7 | 4.025 | ||
| Means for Main Effect of Enzyme | ||||||||
| − | 708.5 | 153.5 | 4.895 | 707.4 | 165.0 | 4.407 | ||
| + | 709.8 | 156.9 | 4.863 | 747.5 | 146.5 | 5.431 | ||
| CVC × Enzyme | ||||||||
| − | − | 745.4 | 136.4 | 5.543 | 749.0 | 157.1 | 4.799 b | |
| + | − | 671.6 | 170.5 | 4.247 | 665.8 | 173.0 | 4.019 b | |
| − | + | 765.7 | 127.6 | 6.172 | 796.7 | 118.5 | 6.830 a | |
| + | + | 654.0 | 186.2 | 3.554 | 698.3 | 174.4 | 4.031 b | |
| SD 3 | 95.25 | 34.32 | 0.819 | 67.05 | 23.17 | 0.872 | ||
| Probability | ||||||||
| CVC | 0.028 | 0.004 | <0.001 | 0.004 | 0.001 | <0.001 | ||
| Enzyme | 0.973 | 0.810 | 0.925 | 0.164 | 0.067 | 0.010 | ||
| Diet × Enzyme | 0.634 | 0.394 | 0.064 | 0.788 | 0.050 | 0.011 | ||
1 n for simple effects of minus CVC × minus Enzyme = 7, plus CVC × minus Enzyme = 5, minus CVC × plus Enzyme = 6, plus CVC × plus Enzyme = 6; 2 n for simple effects of minus CVC × minus Enzyme = 6, plus CVC × minus Enzyme = 7, minus CVC × plus Enzyme = 7, plus CVC × plus Enzyme = 6; 3 Standard deviation. a,b Means within a column without a common superscript differ (p < 0.05).