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KMID : 1094020030200020166
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Journal of Veterinary Clinics
2003 Volume.20 No. 2 p.166 ~ p.171
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Antimicrobial Susceptibility of Microorganisms Isolated from Quarter Milk Samples of Holstein Cows
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이정치
이채용/김상기/이정길/서국현
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Abstract
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Milk samples were collected from a total of 418 quarters of 214 Holstein cows. Of these, samples which were positive on California Mastitis Test (CMT) and above 200,000 cells/ml by somatic cell counts were subjected to bacteriological examination and antimicrobial susceptibility test. Major pathogens responsible for mastitis included coagulase-negative staphylococci (34.3%), coagulase-positive staphylococci (21.5%), gran-negative rod (coliforms and noncoliforms: 12.6%) and Streptococcus spp. (8.4%). These strains were tested with 13 antimicrobial agents by the Kirby and Bauer standardized disc diffusion method. The isolated pathogens were mostly susceptible to amoxicillin and cephalothin, but were resistant to erythromycin.
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KEYWORD
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