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Communication Dans Un Congrès Année : 2011

Effect of farming system characteristics on the effectiveness of paratuberculosis control in a dairy herd

Résumé

Paratuberculosis control is a major concern in major dairy producing areas. In most European countries, no vaccine is available and control relies on reducing within-herd transmission through improved biosecurity for young calves, and on testing and culling infected animals. Effectiveness of control in dairy farms is highly variable, and farming system characteristics are a assumed to play an important role in the observed differences. A paratuberculosis transmission model and a herd simulation model were combined to investigate effects of calf housing, hygiene, and occurence of involuntary culling due to other disorders (mastitis and infertility) on the effectiveness and the efficiency of paratuberculosis control. The herd was managed under a quota constraint. Several surveillance systems and control actions for paratuberculosis were combined and compared. Effects of the control programmes can be compared in terms of prevalence of infectious animals, replacement rate, resulting herd size and quota achievement. The type of calf housing had a minor effect contrary to hygiene management and time-to-cull infectious animals. Whatever the surveillance in place to trigger a control programme (surveillance based on either clinical case, or on systematic testing with tests of limited sensitivity), hygiene and involuntary culling interacted to a large extent on the results of the control programme. Implementing systematic test-and-cull was more efficient than clinical surveillance or doing nothing after 7 to 13 years. Return on investment of systematic surveillance was higher and occurred earlier when hygiene was impaired. The differences between control scenarios were small when hygiene was improved. Modelling is a valuable tool to account for farm characteristics.
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Dates et versions

hal-02745022 , version 1 (03-06-2020)

Identifiants

  • HAL Id : hal-02745022 , version 1
  • PRODINRA : 163037

Citer

Christine Fourichon, Clara Marcé, Henri H. Seegers, Dirk Pfeiffer, Pauline Ezanno. Effect of farming system characteristics on the effectiveness of paratuberculosis control in a dairy herd. 62. Annual Meeting of the European Association for Animal Production (EAAP), European Association for Animal Production (EAAP). Labo/service de l'auteur, ITA., Aug 2011, Stavanger, Norway. ⟨hal-02745022⟩
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