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Dernière mise à jour : Mai 2018

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A diversified response for dairy cows at high risk of paratuberculosis - identifying and predicting phenotypes

A diversified response for dairy cows at high risk of paratuberculosis - identifying and predicting phenotypes

La paratuberculose bovine, incurable, est présente dans de très nombreux troupeaux. Elle obère le bien-être et les performances des animaux et induit des contraintes pour le commerce. Le suivi, sur plusieurs mois et à large échelle, d’animaux dans des troupeaux bovins laitiers infectés a permis de montrer la variabilité de la réponse des animaux quant à l’excrétion de la bactérie dans leurs fèces, en termes de niveau d’excrétion, de caractère continu ou non, et de progression vers une excrétion massive. Certaines vaches n’excrètent jamais la bactérie alors que d’autres l’excrètent en quantité importante et de façon persistante, des profils intermédiaires étant rencontrés. La répartition des vaches entre profils d’excrétion ne dépend pas de la race, de l’âge ni de la parité, mais varie entre troupeaux. Connaître et caractériser ces phénotypes est important pour chercher de nouvelles voies de maîtrise de la paratuberculose, y compris celle de la génétique.

Bibliography :

Navarro-Gonzalez N., Fourichon C., Blanquefort P., Delafosse A., Joly A., Ngwa-Mbot D., Biet F., Boichard D., Schibler L., Journaux L., Meens E., Guatteo R. 2019. Longitudinal study of Mycobacterium avium ssp. paratuberculosis fecal shedding patterns and concurrent serological patterns in naturally infected dairy cattle. Journal of Dairy Science, 102(10):9117-9137 DOI: 10.3168/jds.2018-15897.

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