[en] A comparison of somatic cell count and antimicrobial susceptibility of subclinical mastitis pathogens in organic and conventional dairy herds.Bovine subclinical mastitis is the most important disease affecting dairy cows. The fluctuating increase in somatic cell count (SCC) that occurs causes major economic losses in dairy industry. This comparative study between conventional and organic dairy herds was conducted in the aim to better characterize which consequences might have different management practices on SCC but also on the frequency of pathogens isolated and their antimicrobial susceptibility. Four conventional and four organic herds, with bulk milk SCC >300x103cells/ml were selected, in which respectively 47 and 44 cows were investigated. Each quarter was sampled 3 times at 15 days interval for SCC, microbiological analysis and antimicrobial susceptibility. In both herd categories, major pathogens isolated were by order of importance Streptococcus uberis, Staphylococcus aureus and Streptococcus dysgalactiae with a great impact on SCC. Coagulase negative staphylococci were the most frequent minor germs and had a moderated but real impact on SCC. In certified organic dairy farms, the three most frequently isolated major pathogens were significantly more susceptible to antimicrobials in vitro. This study suggests that the limited use of antibiotics in organic dairy herds could explain, at least in part, the lower resistance obtained from analysed isolates. [fr] La mammite subclinique est une pathologie de première importance chez la vache laitière. L’élévation persistante du taux cellulaire qui en résulte engendre d’énormes pertes économiques pour toute la filière laitière. L’objectif de cette étude était de comparer les filières conventionnelle et biologique afin de déterminer les conséquences que des pratiques d’élevage différentes peuvent avoir sur les taux cellulaires ainsi que sur la fréquence des germes isolés et leur sensibilité aux antibiotiques. Quatre exploitations laitières conventionnelles et 4 biologiques avec des taux cellulaires de lait de tank >300x103 cellules/ml ont été sélectionnées, parmi lesquelles 47 et 44 vaches respectivement ont été investiguées. Chaque quartier a été prélevé 3 fois à 15 jours d’intervalle pour les analyses cellulaires, bactériologiques et de sensibilité aux antibiotiques. Quelle que soit la filière, les germes majeurs rencontrés étaient par ordre d’importance Streptococcus uberis, Staphylococcus aureus et Streptococcus dysgalactiae et leur impact sur le taux cellulaire était très important. Les staphylocoques coagulase négative étaient les germes mineurs les plus fréquents et avaient un impact sur le taux cellulaire non négligeable. La sensibilité moyenne aux antibiotiques testés in vitro était significativement plus élevée en filière biologique pour les trois germes majeurs les plus fréquemment rencontrés. Cette étude suggère que l’usage moins abondant des antimicrobiens dans les exploitations biologiques sélectionnées pourrait expliquer, du moins en partie, les moindres taux d’antibiorésistance retrouvés.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Boutet, Philippe; Université de Liège - ULiège
Detilleux, Johann ; Université de Liège - ULiège > Département de productions animales > Génétique quantitative
Motkin, Michel ; Université de Liège - ULiège > Services généraux (Faculté de médecine vétérinaire) > Service administratif de la Faculté (Médecine vétérinaire)
Deliege, M.
Piraux, E.
Depinois, A.
Debliquy, P.
Mainil, Jacques ; Université de Liège - ULiège > Département des maladies infectieuses et parasitaires > Bactériologie et pathologie des maladies bactériennes
Czaplicki, G.
Lekeux, Pierre ; Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie
Language :
French
Title :
A comparison of somatic cell count and antimicrobial susceptibility of subclinical mastitis pathogens in organic and conventional dairy herds
Alternative titles :
[fr] Comparaison du taux cellulaire et de la sensibilité antimicrobienne des germes responsables de mammite subclinique bovine entre les filières conventionnelle et biologique
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