Table 2.
Summary of immune and performance traits for pigs from SPF and non-SPF farms1
| Health status | SPF | Non-SPF |
|---|---|---|
| Number of pigs tested | ||
| - immune traits | 674 | 606 |
| - performance traits | 1549 | 1093 |
| Measurement (units) | Mean (variance) | Mean (variance) |
| White blood cells | 22.2 (16.9) | 24.0 (9.4) |
| MNL% | 70.2 (9.10) | 71.2 (11.6) |
| PMNL% | 29.9 (9.10) | 28.9 (11.6) |
| PBML subsets: | ||
| CD4+ | 17.8 (4.87) | 18.0 (5.64) |
| CD8α+ | 28.8 (7.16) | 27.4 (6.69) |
| CD4+CD8α+ | 7.51 (2.99) | 7.29 (3.30) |
| CD4+CD8α- | 10.2 (3.83) | 11.3 (3.79) |
| CD8αβ+ | 14.2 (4.57) | 11.8 (4.02) |
| CD11R1+ total | 14.0 (4.49) | 14.1 (5.38) |
| CD11R1+CD8α+ | 5.57 (2.94) | 4.48 (2.61) |
| CD11R1+CD8α- | 8.37 (3.11) | 8.43 (3.65) |
| γδ+ T cells | 29.2 (8.36) | 33.2 (12.5) |
| B cells | 12.4 (5.33) | 14.5 (6.19) |
| Monocytes | 10.6 (4.85) | 9.86 (4.09) |
| CD14+ | 5.21 (2.48) | 6.18 (3.45) |
| CD16+ | 18.0 (5.00) | 18.4 (6.26) |
| APP, μg/ml: | ||
| Haptoglobin | 0.78 (0.62) | 0.69 (0.65) |
| TTR | 442.6 (170.0) | 555.3 (141.7) |
| CRP | 145.6 (164.6) | 144.4 (133.0) |
| AGP | 744.8 (278.7) | 388.3 (165.3) |
| ADG, kg/d | 0.86 (0.16) | 0.85 (0.17) |
| age (d), at start-test | 80.9 (9.4) | 94.7 (10.1) |
| age (d), at end-test | 146 (10.4) | 151 (12.1) |
| Ag density: | ||
| all CD8α+ cells | 34185 (22820) | 28936 (6936) |
| CD8α+ "dim" cells | 15423 (9521) | 13422 (3330) |
| CD8α+ "bright" cells | 66368 (42468) | 61150 (14483) |
| all CD8β+ cells | 27046 (16257) | 20692 (4932) |
1 White blood cells expressed as no. cells × 106/mL, PBML sub-sets expressed as proportion of mononuclear leucocytes and antigen density expressed as the number of antibody binding sites per cell (see Materials and Methods).