POTENTIAL BENEFITS OF SERUM PROFILING FOR RESPIRATORY DISEASE CONTROL

On one Slovenian large pig farm 36 litters were selected from a herd to make serum profiles to selected (important) respiratory pathogens for preparation of specific control measures. 36 serum samples from breeding sows and 342 serum samples from pigs (38 serum samples; 9 samplings) were tested for antibodies to Porcine Circovirus Type 2 (PCV2), Swine Influenza Virus (SIV), Mycoplasma hyopneumoniae, Actinobacillus pleuropneumoniae and Haemophilus parasuis. The same pigs were bled at 2, 4,
6, 8, 11, 14, 17, 22 and 28 weeks of age. Commercial ELISA kits of different producers were used. In breeding sows seroprevalence to SIV, A. pleuropneumoniae was 100 %, to PVC2 94 %, to M. hyopneumoniae 83,3 % and to H. parasuis 36 %. Colostral antibodies in pigs against SIV and PCV2 persisted for about 4 weeks. The lowest seroprevalence was detected in 6 weeks old pigs against both viruses. According to serum profiles vaccination of sows against SIV and PCV2 can be proposed. Colostral antibodies against A. pleuropneumoniae persisted for almost 8 weeks (94,8 % prevalence). The lowest prevalence was detected in 14 weeks old pigs (53,8 %). According to serum profiles vaccination against A. pleuropneumoniae around 11-14 weeks of age can be proposed. Till 8 weeks of age pigs were seronegative against H. parasuis. The seroprevalence increased at 11 weeks of age. Vaccination against
H. parasuis around 8-9 weeks of age can be proposed. The seroprevalence against M. hyopneumoniae at 6 weeks of age decreased to 0 % and at 11 weeks of age started to increase. Second vaccination between 11.-14. weeks of age can be proposed.