Table 6.
Effects of heat stress on the plasma immunoglobulin and lysozyme and the guanidinoacetic acid (GAA) intervention effects in broilers.
| Treatment1 |
P value3 |
|||||
|---|---|---|---|---|---|---|
| Items2 | NC | HS | PF | HG | ANOVA | T test |
| Heat exposure for 7 d | ||||||
| IgA (mg/mL) | 8.36 ± 0.40 | 7.51 ± 0.96 | 6.59 ± 0.59 | 8.03 ± 0.54 | 0.087 | 0.287 |
| IgG (mg/mL) | 11.77 ± 0.78a | 8.26 ± 1.22b | 10.45 ± 1.09ab | 12.14 ± 0.84 | 0.016 | 0.529 |
| IgM (mg/mL) | 8.05 ± 0.54 | 7.15 ± 0.45 | 6.75 ± 0.37 | 6.59 ± 0.65 | 0.082 | 0.197 |
| Lysozyme (μg/mL) | 0.52 ± 0.06a | 0.14 ± 0.05b | 0.52 ± 0.03a | 0.21 ± 0.02* | <0.001 | 0.001 |
| Heat exposure for 14 d | ||||||
| IgA (mg/mL) | 8.99 ± 0.25 | 8.07 ± 0.25 | 8.50 ± 0.86 | 9.54 ± 0.26 | 0.165 | 0.687 |
| IgG (mg/mL) | 16.11 ± 2.91a | 9.80 ± 1.09b | 8.59 ± 1.02b | 15.42 ± 2.72* | 0.029 | 0.001 |
| IgM (mg/mL) | 8.53 ± 0.40 | 7.73 ± 0.23 | 7.83 ± 0.69 | 9.33 ± 0.23* | 0.299 | 0.012 |
| Lysozyme (μg/mL) | 0.34 ± 0.04 | 0.39 ± 0.05 | 0.45 ± 0.04 | 0.40 ± 0.27 | 0.190 | 0.098 |
1
NC, normal control group; HS, heat stress group; PF, pair-fed group; HG, GAA group. Values are mean ± SE of 6 replicates.
2
IgA, immunoglobulin A; IgG, immunoglobulin G; IgM, immunoglobulin M.
3
One-way ANOVA and Tukey's test were conducted for the NC, HS, and HG groups; T test was conducted for the HS and HG groups.
ab
Means with different superscripts within each row are significantly different among the NC, HS, and PF groups (P < 0.05).
⁎
Means with asterisk indicate a significant difference between HS and HG group (P < 0.05).