ORIGINAL PAPER
Staphylococcus aureus related mammary infection in cows: Correlation between somatic cell count and proteolysis during early and chronic phase of infection
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Unité de Recherche “Animal et Fonctionnalités des Produits Animaux”, Institut National de la Recherche Agronomique, France ENSAIA (Ecole Nationale Supérieure d’Agronomie et des Industries Alimentaires), 2 Avenue de la Forêt de Haye B.P. 172, 54505 Vandoeuvre Cedex, France
 
 
Publication date: 2007-01-26
 
 
Corresponding author
Y. Le Roux   

Unité de Recherche “Animal et Fonctionnalités des Produits Animaux”, Institut National de la Recherche Agronomique, France ENSAIA (Ecole Nationale Supérieure d’Agronomie et des Industries Alimentaires), 2 Avenue de la Forêt de Haye B.P. 172, 54505 Vandoeuvre Cedex, France
 
 
J. Anim. Feed Sci. 2007;16(Suppl. 1):117-129
 
ABSTRACT
Experimental mastitis induced by the S. aureus in six dairy cows was performed to investigate the relationship between somatic cell count (SCC) and proteolysis during early and chronic phase of infection (up to 28 days post-infection). An elevated level of infection was detected during the early phase and was characterized by a measurable link between SCC and proteose-peptone content. In contrast to this observation, no significant relationship was detectable between the two parameters during the chronic phase of infection. During this phase the measurement of SCC could not be established as a reliable indicator of milk proteolysis. Moreover, the results of this study demonstrated that the high risk of milk proteolysis associated with an elevated SCC content does not consistently obey the opinion that excessive SCC results in a high level of proteolysis of milk. Our results were compared with experimental E. coli mastitis in order to evaluate the differences that exist between the courses of bovine intramammary infection caused by S. aureus and E. coli.
 
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Lotte Larsen, Søren Nielsen, Lizandra Paludetti, Alan Kelly
 
ISSN:1230-1388
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