Table 3.
Effect of lipopolysaccharide (LPS) treatment on circulating corticosterone (CORT) and immune parameters.
| Dependent Variable |
LPS Treatment | Hatch Date | Clutch # | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day | N | Est | SE | P | N | Est | SE | P | N | Est | SE | P | |
| 60 | Stress CORT | 99 | 0.51 | 0.07 | <0.001 | 99 | 0.09 | 0.04 | 0.020 | ||||
|
| |||||||||||||
| 68 | Anti-LPS Ab | 57 | 0.22 | 0.29 | 0.440 | ||||||||
|
| |||||||||||||
| 100 | Baseline Hp | 85 | 0.00 | 0.01 | 0.840 | 85 | −0.02 | 0.01 | <0.001 | ||||
| 12-Hr Hp | 83 | 0.01 | 0.01 | 0.310 | 83 | −0.0 | 0.00 | 0.001 | |||||
|
| |||||||||||||
| 108 | Anti-LPS Ab | 43 | 1.26 | 0.52 | 0.020 | 43 | 0.01 | 0.00 | 0.002 | ||||
Birds challenged with LPS had significantly higher CORT concentrations one hour after challenge than control birds (LPS CORT) and significantly higher LPS-specific antibody titers (Anti-LPS Ab) on day 108 post-hatch. LPS challenges were administered on days 60 and 100 post-hatch. Hp=haptoglobin, 12-Hr Hp=haptoglobin concentrations measured 12 hours after LPS challenge. Est is the model estimate (slope of the relationship) between parameters. Significant (p<0.05) effects are bolded.