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

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

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.