Table 4.
Growth performance in broiler chickens fed a corn–soybean meal diet supplemented with nucleotide-rich yeast extract (YN) and challenged (d 11 to 15) with Eimeria.
| Eimeria | YN, g/mt | Final BW, g | BWG, g/bird | Feed intake, g/bird | FCR |
|---|---|---|---|---|---|
| No | 0 | 411.8 | 168.8 | 193.8 | 1.154 |
| No | 500 | 417.3 | 177.5 | 189.2 | 1.064 |
| Yes | 0 | 389.3 | 147.0 | 202.0 | 1.417 |
| Yes | 500 | 409.3 | 163.0 | 182.3 | 1.119 |
| SEM | 6.11 | 5.58 | 9.195 | 0.104 | |
| Main effect, Eimeria | No | 415.7a | 172.8a | 192.3 | 1.120 |
| Yes | 398.2b | 155.3b | 191.2 | 1.257 | |
| Main effect, YN, g/mt | 0 | 400.7a | 157.9b | 197.9 | 1.287 |
| 500 | 413.2b | 170.3a | 185.8 | 1.090 | |
| SEM | 3.99 | 3.95 | 6.5 | 0.074 | |
| Probabilities | |||||
| Eimeria | 0.021 | <0.01 | 0.943 | 0.142 | |
| YN | 0.049 | 0.039 | 0.201 | 0.078 | |
| Eimeria×YN | 0.249 | 0.519 | 0.424 | 0.329 | |
Means assigned different letter superscripts within a response criterion differ, P ≤ 0.05.