Efficacy of Porcilis PRRS - Field trials, Poland
Two trials were carried out in Poland on farms experiencing respiratory problems in their pigs.
Trial 1
Method
A field trial was carried out on a farm with serious respiratory problems probably due to PRRSV.
A group of 1858 pigs were used. 960 pigs received a Porcilis PRRS vaccination and the remaining 898 pigs were vaccinated with a placebo.
The pigs were all housed together. This meant that infection pressure for the vaccinated pigs was higher compared to a situation where the entire house is vaccinated. Conversely infection pressure for the unvaccinated control pigs was lower than in a field situation where none in the group are vaccinated.
Results
| Vaccinated | Controls | |
|---|---|---|
| Number of pigs | 960 | 898 |
| Treatments | 26.6% | 33.6% |
| Drop-outs | 3.5% | 5.2% |
| Mortality | 4.3% | 5.1% |
| Growth/day | 615g | 606g |
Mortality rate during the trial
Treatments given during the trial
Average daily gain during the trial
No local or systemic effects of vaccination were noted during the trial.
Conclusion
Vaccination with Porcilis PRRS improved performance.
Trial 2
A total of 8529 pigs on four farms were vaccinated and their data compared with those of 4625 unvaccinated pigs (Pejsak, Z., 2000).
Results
| Farm | Group | No of animals | Days to slaughter | Feed Conv. (kg) | ADG (g) | % animals treated |
|---|---|---|---|---|---|---|
| W | V | 3880 | 180 | 3.42 | 663 | 36 |
| C | 1252 | 189 | 3.67 | 608 | 69 | |
| P | V | 554 | 183 | 3.48 | 677 | 6 |
| C | 1045 | 192 | 3.59 | 596 | 31 | |
| C | V | 2260 | 191 | 3.39 | 633 | 5 |
| C | 1143 | 192 | 3.60 | 585 | 9 | |
| M | V | 1835 | 182 | 3.37 | 662 | 5 |
| C | 1185 | 195 | 3.48 | 603 | 15 |
Average daily gain of vaccinated and control groups on the farms
The results of this trial were:
- No adverse clinical signs were seen after vaccination.
- An increase in the mean daily weight gain on all farms.
- The number of veterinary treatments dropped substantially in the vaccinated groups.
- On all four farms the occurrence of respiratory problems was reduced in the vaccinated groups.
Conclusion
In this study there was a significant improvement of the overall herd performance.