The effects of vaccination of a porcine parvovirus (PPV) in gilts and the first four litters were studied in a pig-breeding herd. In addition to determination of the technical results, PPV and influenza (H1N1) titres were measured. From the serological findings it was apparent that PPV and influenza (H1N1) virus circulated during the trial. The number of total-born and live-born piglets was significantly higher in the first litter when PPV-vaccinated and non-vaccinated gilts were compared. On the basis of these results, it is recommended to vaccinate sows and gilts after the first litter.
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