Study of Subclinical Mastitis in Dairy Herds of North Paraná, Brazil / Estudo da mastite subclínica em rebanhos leiteiros no norte do Paraná
Beloti, Vanerli; Eckehardt Müller, Ernst; Cesar de Freitas, Julio; Mettifogo, Elena.
Semina Ci. agr.;
18(1): 45-53, 1997.
Artigo
em Português
| VETINDEX
| ID: vti-472096
Resumo
California Mastitis Test (CMT) was performed in five hundred and three Holstein cows from the north region of Paraná. One hundred and fifithy of these cows (29,82%) and 295 quarters in the CMT were positives. In 223 milk samples was observed bacterial growth (213 pure cultures and 10 associated cultures). The most commonly agents isolated in pure growth were, staphylococci (30,51%), whereas S. aureus (17,97%) and coagulase negative staphylococci (12,54%), streptococci (21,69%) and C. bovis (18,98%). Colonie"s counter was performed in 193 milk samples. Of these samples, 9 had less than 3 x 102 CFU/ml, 22 had between 3 x 102 to 103 CFU/ml, 17 had between 103 to 3 x 103 CFU/ml and 145 had more 3 x 103 CFU/ml. The mean somatic cell count for the main agents isolated were 2,9 x 106/ml for streptococci, 2,5 x 106/ml for S. aureus, 1,2 x 106/ml for CNS. The most commonly species of CNS were S. hyicus (25,00%), S. chromogenes (15,00%), S. epidermidis(~\ 5,00%), S. simulans (5,00%) and S. warneri(5,00%). Thirty comma thirty percent of 33 isolated, were resistant to lincomycin, 27,27% to tetracycline, 18,18% to penicillin and novobiocin, 15,15% to ampicillin and erytromycin.Foram examinadas através do "California Mastitis Test" (CMT) 503 vacas da raça holandesa em propriedades da região norte do Paraná. Destes animais, 150 (29,82%) apresentaram resultados positivos, totalizando 295 quartos. Crescimento bacteriano foi obtido em 223 amostras de leite, sendo 213 culturas puras e 10 mistas. Os agentes isolados com maior freqüência em cultura pura foram os estafilococos (30,51%), sendo 17,97% S. aureus e 12,54% estafilococos coagulase negativos (ECN), estreptococos (21,69%) e C. bovis (18,98%). O número de unidades formadoras de colónias (UFC) de 193 amostras de leite mostrou nove com contagens inferiores a 3 x 102/ml, 22 com 3 x 102 a 103/ml, 17 com 103 a 3 x 103/ml e, 145 superiores a 3 x 103/ml. As médias das contagens de células somáticas (CCS) para as principais bactérias isoladas foram: estreptococos (2,9 x 106/ ml); S. aureus (2,5 x 106/ml); ECN (1,2 x 106/ml) e C. bovis (979 x 103/ml). Entre os ECN predominaram o S. hyicus (25,00%), S. chromogenes (15,00%), S. epidermidis (15,00%), S. simulans (5,00%) e S. warneri (5,00%). Dos 33 ECN, 30,30% foram resistentes à lincomicina, 27,27% àtetraciclina, 18,18% à penicilina e à novobiocina e 15,15% à ampicilina e à eritromicina.
Biblioteca responsável:
BR68.1
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