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

Results of field trial in Poland
  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 graph

Mortality rate during the trial

treatment rate graph

Treatments given during the trial

average daily gain graph

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

Influence of vaccination against PRRS on performance of weaners and fatteners. V=vaccinated; C=unvaccinated
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 graph

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.