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The antibiotic use in the food producing business in the Netherlands is one of the highest in the EU and has great governmental attention. Vaccination can play a vital role in the reduction of the use of antibiotics and at the same time improve the technical performance. Production data of a 460 sow farm was retrospectively reviewed from January 2008 until December 2009. Begin 2008 the farm expanded their fattening unit from 1900 to 3500 places. At the same time with this expansion, big health problems were seen in the fattening unit, resulting in a high number of runts, mortality, lung problems and big difference in uniformity. These problems did not resolve although a lot of antibiotics were used. In August 2008 PCV2 was diagnosed as primary agent by multiple necropsies in pigs of 12 to 17 weeks of age and positive convalescent serology. Ingelvac CircoFLEX® vaccination (1 ml) was implemented (pigs from 15 weeks backwards to 5 weeks of age were vaccinated at start; from that point pigs from 5 weeks of age for convenience reasons). Continuous flow data was used for evaluation, on monthly basis: 8 months before vaccinationtransition period of 4 months – 12 months of vaccinated pigs. A clear improvement was seen in growth (654 vs 747 vs 834 g/d) and a reduction of mortality (4,39 vs 4,9 vs 2,20 %). The use of antibiotics was measured by Defined Daily Dosages (DDD), the standard method used in the Netherlands to compare antibiotic use in time, and between farms. At the same time the production parameters improved, the amount of antibiotics used reduced strongly by -39% in the fattening unit (49,87 vs 45,12 vs 30,27 DDD). The vaccinated pigs of the last 8 months had a further improvement in growth, mortality and antibiotic use (18 DDD). Introduction The antibiotic use in the food producing business in the Netherlands is one of the highest in the EU (1,2) and has come under greater governmental attention the last years (3). Vaccination against different diseases can play a vital role in the reduction of the use of antibiotics and at the same time improve the technical performance, resulting in a better economical payoff for the primary producer (4, 5). For PCV2 it is known it can have an immunosuppressive effect (6) and as a result of this secondary (bacterial) infections can have a bigger impact. This study looks at the technical performance and the antibiotic use in the fattening unit following the introduction of a PCV2 vaccine in the nursery. Material and Methods Production data of a 460 sow farm was retrospectively reviewed for the period January 2008 until December 2009. Begin 2008 the farm expanded their fattening unit from 1500 to 3500 places (closed herd). At the same time with this expansion, big health problems were seen in the fattening unit, resulting in a high number of runts, mortality, lung problems and big difference in uniformity. These problems did not resolve although a lot of antibiotics were used. In August 2008 PCV2 was diagnosed as primary agent by multiple necropsies in pigs of 12 to 17 weeks of age (with high viral load) and positive convalescent serology. Immediately Ingelvac CircoFLEX® vaccination (1 ml) was implemented (pigs from 15 weeks backwards to 5 weeks of age were vaccinated at start; from that point pigs from 5 weeks of age for convenience reasons). Continuous flow technical data was used for evaluation, on monthly data basis: 8 months before vaccinationtransition period of 4 months – 12 months of vaccinated pigs. The following parameters were evaluated over time: average daily gain (ADG), mortality and antibiotic use, over the 3 defined periods. The use of antibiotics was measured by Defined Daily Dosages (DDD), the standard method used now in the Netherlands to compare the antibiotic use in time, and between farms (2, 7, 8).

Reduction of antibiotics after implementing PCV2 vaccination on 460 sow Dutch pigfarm