Table 3.
Main and simple effects of coccidia vaccine challenge (CVC) and exogenous enzyme supplementation on nutrient and energy retention, apparent metabolizable energy (AME), and apparent metabolizable energy corrected for nitrogen (AMEn) in 21-day-old broiler chickens fed corn-soybean meal-based diets (7-day post-challenge) 1.
| Coccidia Vaccine Challenge | Enzyme | Dry Matter, % | Nitrogen, % | Energy, % | AME | AMEn |
|---|---|---|---|---|---|---|
| Means for Main Effect of CVC | ||||||
| − | 73.0 | 70.1 | 75.9 | 3404 | 3318 | |
| + | 62.2 | 63.0 | 62.4 | 2800 | 2692 | |
| Means for Main Effect of Enzyme | ||||||
| − | 66.9 | 65.8 | 68.4 | 3077 | 2979 | |
| + | 68.2 | 67.3 | 69.8 | 3126 | 3032 | |
| CVC × Enzyme | ||||||
| − | − | 73.2 | 70.5 a | 76.0 | 3418 | 3333 |
| + | − | 60.7 | 61.2 c | 60.9 | 2737 | 2624 |
| − | + | 72.8 | 69.7 a | 75.7 | 3391 | 3303 |
| + | + | 63.6 | 64.9 b | 63.9 | 2862 | 2760 |
| SD 2 | 2.61 | 1.89 | 2.17 | 97.34 | 101.64 | |
| Probability | ||||||
| CVC | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | |
| Enzyme | 0.251 | 0.076 | 0.146 | 0.236 | 0.219 | |
| Enzyme × CCV | 0.146 | 0.007 | 0.075 | 0.071 | 0.061 | |
1 n for simple effects of minus CVC × minus Enzyme = 6, plus CVC × minus Enzyme = 6, minus CVC × plus Enzyme = 7, plus CVC × plus Enzyme = 6; 2 Standard deviation. a–c Means within a column without a common superscript differ (p < 0.05).