Table 1.
Descriptive statistics of nine immune traits.
| Trait 1 | N-Obs 2 | Average | SD 3 | Min Value | Max Value |
|---|---|---|---|---|---|
| Ab-AIV | 455 | 9.479 | 1.558 | 5.000 | 12.000 |
| Ab-NDV | 384 | 5.505 | 1.262 | 3.000 | 9.000 |
| SRBC | 519 | 7.788 | 1.191 | 4.000 | 10.000 |
| H/L | 519 | 0.438 | 0.294 | 0.024 | 1.579 |
| IgG | 466 | 542.855 | 219.233 | 144.670 | 1754.730 |
| SII | 519 | 0.150 | 0.037 | 0.059 | 0.303 |
| TII | 514 | 0.477 | 0.174 | 0.043 | 1.045 |
| TW | 515 | 7.217 | 2.786 | 0.460 | 17.610 |
| SW | 519 | 2.269 | 0.622 | 0.800 | 4.360 |
1 Ab-AIV, antibody response to avian influenza virus; Ab-NDV, antibody response to Newcastle disease virus; SRBC, sheep red blood cell antibody titer; H/L, the ratio of heterophils to lymphocytes; IgG (ng/ml), immunoglobulin G; SII (%), spleen immune index; TII (%), thymus immune index; TW (g), thymus weight at 100 d; SW (g), spleen weight at 100 d.; 2 number of observations.3 Standard deviation.