Table 2.
Generalized Linear Model (GLM) results. The effects of different percentages of infected and vaccinated animals and management regimes on the percentages of viable and sick animals, and of animals showing total weight loss, during the nursery and fattening phases of production. Two management regimes are compared: orderly movements, in which fattening pens are filled with piglets housed together in the nursery unit according to the identity of their mother (mother management); and random movements, where piglets are assigned to the nursery and fattening pens at random (random management).
| GLM Models | Estimate | p-Value | Estimate | p-Value |
|---|---|---|---|---|
| % of viable animals | Nursery | Fattening | ||
| (Intercept) | 4.578 | <0.001 | 4.559 | <0.001 |
| Infected 10 | −0.026 | 0.0892 | −0.045 | 0.004 |
| Infected 15 | −0.033 | 0.0350 | −0.080 | <0.001 |
| Infected 20 | −0.024 | 0.1178 | −0.036 | 0.022 |
| 25% of vaccinated animals | −0.057 | 0.0011 | −0.072 | <0.001 |
| 50% of vaccinated animals | −0.037 | 0.0300 | −0.054 | 0.002 |
| 75% of vaccinated animals | −0.017 | 0.327 | −0.028 | 0.115 |
| Non vaccinated | −0.072 | <0.001 | −0.083 | <0.001 |
| Random management | 0.0004 | 0.971 | 0.003 | 0.770 |
| Deviance of model | 89.99% | 69.79% | ||
| % of sick animals | Nursery | Fattening | ||
| (Intercept) | 2.303 | <0.001 | 0.107 | 0.412 |
| Infected 10 | 0.364 | <0.001 | 0.063 | 0.073 |
| Infected 15 | 0.485 | <0.001 | −1.650 | <0.001 |
| Infected 20 | 0.5601 | <0.001 | −0.547 | <0.001 |
| 25% of vaccinated animals | 1.774 | <0.001 | 3.051 | <0.001 |
| 50% of vaccinated animals | 1.576 | <0.001 | 3.091 | <0.001 |
| 75% of vaccinated animals | 0.998 | <0.001 | 2.531 | <0.001 |
| Non vaccinated | 1.829 | <0.001 | 2.807 | <0.001 |
| Random management | 0.002 | 0.905 | 0.143 | <0.001 |
| Deviance of model | 96.06% | 75.45% | ||
| % of loss weight due to disease | Nursery | Fattening | ||
| (Intercept) | 1.464 | <0.001 | 1.9545 | <0.001 |
| Infected 10 | 0.328 | <0.001 | 0.2126 | <0.001 |
| Infected 15 | 0.433 | <0.001 | 0.3552 | <0.001 |
| Infected 20 | 0.404 | <0.001 | 0.1792 | <0.001 |
| 25% of vaccinated animals | 0.862 | <0.001 | 0.6088 | <0.001 |
| 50% of vaccinated animals | 0.695 | <0.001 | 0.4875 | <0.001 |
| 75% of vaccinated animals | 0.314 | <0.001 | 0.3019 | <0.001 |
| Non vaccinated | 0.984 | <0.001 | 0.6465 | <0.001 |
| Random management | 0.002 | 0.939 | −0.0249 | 0.393 |
| Deviance of model | 88.38% | 88.45% | ||