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. 2008 Jun;49(6):569-76.

Estimate of the direct production losses in Canadian dairy herds with subclinical Mycobacterium avium subspecies paratuberculosis infection

Ashwani Tiwari  1 , John A VanLeeuwen, Ian R Dohoo, Greg P Keefe, Alfons Weersink
Affiliations

Estimate of the direct production losses in Canadian dairy herds with subclinical Mycobacterium avium subspecies paratuberculosis infection

Ashwani Tiwari et al. Can Vet J. 2008 Jun.

Abstract
in English, French

The objective of this study was to estimate the annual losses from Mycobacterium avium subspecies paratuberculosis (MAP) for an average, MAP-seropositive, Canadian dairy herd. A partial-budget simulation model was developed with 4 components of direct production losses (decreased milk production, premature voluntary culling, mortality, and reproductive losses). Input values were obtained primarily from a national seroprevalence survey of 373 Canadian dairy farms in 8 of 10 provinces. The model took into account the variability and uncertainty of the required input values; consequently, it produced probability distributions of the estimated losses. For an average Canadian dairy herd with 12.7% of 61 cows seropositive for MAP, the mean loss was $2992 (95% C.I., $143 to $9741) annually, or $49 per cow per year. Additional culling, decreased milk production, mortality, and reproductive losses accounted for 46%, 9%, 16%, and 29% of the losses, respectively. Canadian dairy producers should use best management practices to reduce these substantial annual losses.

Estimé des pertes directes de production dans les troupeaux laitiers du Canada à la suite d’infections subcliniques à Mycobacterium avium, sous-espèce paratuberculasis. L’objectif de cette étude était d’évaluer les pertes annuelles causées par Mycobacterium avium sous-espèce paratuberculosis (MAP) pour un troupeau laitier canadien moyen séropositif au MAP. Un modèle de simulation de budget partiel à 4 volets de pertes directes de production (diminution de la production laitière, réforme volontaire anticipée, mortalité et pertes reproductives) a été développé. Les données ont été obtenues principalement à partir d’une enquête nationale sur la séroprévalence effectuée sur 373 fermes laitières canadiennes situées dans 8 des 10 provinces. Le modèle a tenu compte de la variabilité et de l’incertitude des données d’entrées et en conséquence a créé des distributions de probabilités des pertes estimées. Pour un troupeau laitier canadien moyen comprenant 12,7 % de 61 vaches séropositives au MAP, la perte moyenne s’établissait à 2992 $ (95 % I.C., 143 $ à 9741 $) annuellement ou 49 $ par vache, par année. La réforme supplémentaire, la diminution de la production laitière, la mortalité et les pertes reproductives comptaient respectivement pour 46 %, 9 %, 16 % et 29 % des pertes. Les producteurs laitiers au Canada devraient utiliser les meilleures pratiques de gestion pour réduire ces pertes annuelles substantielles.

(Traduit par Docteur André Blouin)

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Figures

Figure 1
Figure 1
Distribution of annual economic losses (in Canadian dollars) from MAP-seropositivity for the entire Canadian dairy industry, per 100 cows.
Figure 2
Figure 2
Distribution of annual economic losses (in Canadian dollars) in a MAP-seropositive, 61-cow dairy herd in Canada.
See this image and copyright information in PMC

References

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