Table 2.
Effects of diet and challenge treatments on ELISA IgG titer and MG lesion score (combined incidences of lung conjunctivitis and airsacculitis) in layer pullet at 12 wk of age.
| Treatments | IgG titer1 | Lesion score1 |
|---|---|---|
| Diet | ||
| Control | 1,367.8 ± 161.52 | 0.139 ± 0.0463 |
| XPC | 1,366.1 ± 159.79 | 0.097 ± 0.0459 |
| Main effect P-value | 0.9939 | 0.5289 |
| Challenge | ||
| Nonchallenged | 72.7b ± 159.79 | 0.000b ± 0.0459 |
| Rlow MG-challenged | 2,661.2a ± 161.52 | 0.236a ± 0.0463 |
| Main effect P-value | 0.0001 | 0.0012 |
| Diet-challenge | ||
| Control and Nonchallenged | 79.0 ± 225.98 | 0.000 ± 0.0650 |
| Control and Rlow MG-challenged | 2,656.6 ± 230.84 | 0.278 ± 0.0659 |
| XPC and Nonchallenged | 66.3 ± 225.98 | 0.00 ± 0.0650 |
| XPC and Rlow MG-challenged | 2,665.8 ± 225.98 | 0.194 ± 0.0650 |
| Interaction P-value | 0.9616 | 0.5289 |
a,bMeans in a column within type of variable and main effect or interaction treatment with no common superscript differ significantly (P ≤ 0.05).
Bold indicates P < 0.05.
Abbreviations: Rlow MG, low passage R strain of Mycoplasma gallisepticum; XPC, original XPC.
1
Nine birds in each of 16 replicate units were used to calculate means in the diet and challenge treatment groups, and 9 birds in each of 8 replicate units were used to calculate means in the diet-challenge treatment combination groups.