Identification of bovine mastitis pathogens isolated from dairy herds in the central region of Córdoba

PELLEGRINO, M.; GIRAUDO, J.; FRIGERIO C.; FERNANDEZ I.; GHIONE L.; BOGNI, C.

Tafí del Valle, Tucumán

Jornada; XXIII Jornadas Científicas de la Asociación de Biología de Tucumán; 2006

Asociación de Biología de Tucumán

Bovine mastitis is the most important disease of dairy cattle. Staphylococcus aureus and Streptococcus agalactiae are the main etiological agents. The aim of this work was identify bovine mastitis pathogens from three dairy heard in the central region of Cordoba. A total of 86 milk samples belong to 20% of milking cows were analyzed in regard to: a) bacterial count (ufc/ml), b) somatic cell count (SCC) and c) clinical (MC), subclinical (SM) and cronical CrM) mastitis. A number of 113 strains were isolated. S. aureus was identify in 18.6% of the samples, whereas 1.8%, 33,6% and 5.3% were S. intermedius, coagulase-negative Staphylococci (CNS)and Streptococcus spp, respectively. In the 40.7% of the samples, others microorganisms (Bacillus spp., E. coli, Salinococcus spp. y Micrococcus spp.) were isolated. From 86 animals, 10 (11.62%)had CM, 38 (44%) SM and 1 (1.16%) CrM. S. aureus was isolated in the 40% of the SM, alone (21%) and with other microorganism (19%). In the 55% of the SM, CNS were isolated, alone (21%) and associated to other microorganism (34%). The results shows a considerable increase of CNS isolated from bovine intramammary infections,even though, these microorganisms are part of the normal flora of bovine udder.