The great heterogeneity among porcine reproductive and respiratory syndrome virus (PRRSV) isolates is probably the main obstacle to its effective control using current commercial vaccines, since the induced immunity by one strain is specific only to this strain. Exposure of all breeding pigs to the PRRSV circulating on the farm is an option for elimination of PRRS in breeding herd. Adoption of strict biosecurity measures is essential. The objective of this study was to eliminate the PRRSV from farrow to finish small pig farm (130 breeding pigs) by serum inoculation. The owner was acquainted with the biosecurity measures (strict biosecurity protocols and herd closure for at least 200 days). Breeding pigs were immunized with serum obtained from weaners. Number of high positive breeding pigs decreased from six months after II. serum inoculation till the end of the study, but the prevalence of antibody were almost the same comparing the sampling before serum inoculation to last sampling 13 months after II. serum inoculation. Breeding herd was without virus in all testing’s but PRRSV circulated in two months old weaners. Owner did not implement herd closure and other required biosecurity measures and new strain of PRRSV was introduced. Serum inoculation was not successful for elimination of PRRS from the farrow to finish farm. The implementation of biosecurity measures in field conditions is much more difficult challenge as was expected at the beginning.
COBISS.SI-ID: 3773306
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.
COBISS.SI-ID: 3755898
The paper is focused on the various attempts to organize pig breeders in Slovenia. Associations of pig breeders are somewhat more active at the local levels and less successful at the national level. A disadvantage of the pig industry is reflected even in the less successful cooperation of farmers. In Slovenia, the special forms of cooperation between farms allowing specialization and thus, enlarging as well as unifying supply did not develop yet. Even more issues appear in establishing business driven association of pig farms.
COBISS.SI-ID: 3304328