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To reduce Salmonella contamination of pork food cham at the farm level, control act1ons can a1m at preventmg the introduction of the bactena mto herds or/and at prevent1ng the in-herd transmission. Our a1m IS to estimate the influence of (i) the decontamination efficiency and (ii) the Salmonella status of replacement g11ts on the prevalence of carrier pigs at slaughtering age. We developed a stochastic mathematical model to s1mulate the p1g population dynam1cs and the Salmonella transmiss1on withrn a farrow-to-finish herd. Results show a d1fferent prevalence of carnage rn groups of delivered p1gs according to the scenarios tested The prevalence of carriage in the groups of replacement gilts had more impact on the increase of the prevalence of carrier finishers than the decontamination process. Given the expected objectives of control programs, these results emphasized the need for producers to Implement a high level of room floor decontam1nat1on between consecutive batches and to avo1d rntroduction by carrier replacement gilts 1n Sa/monel/afree herds.

international conference on the epidemiology and control of biological, chemical and physical hazards in pigs and pork

Modelling the prevalence of Salmonella carrier pigs at slaughtering age: influence of management systems and of the Salmonella status of replacement gilts