大邱·慶北地方에서 문제되는 젖소의 慢性 乳房炎에 관한 硏究 = Studies on Chronic Mastitis of Dairy Cattle in Taegu-Kyungpook Provinces

국문 초록 (Abstract)

1984年 10 月부터 1985年 8月末사이에 大學附屬家畜病院에 檢診依賴된 大邱·慶北地方에서 發生한 83 例의 慢性 乳房炎의 原因菌을 分離·同定하고 이 分離菌의 各種 抗生劑에 대한 感受性을 disc diffusion technique로 調査하였다.
大邱·慶北地方에서 문제되는 慢性 乳房炎은 포도구균성 乳房炎이 전체의 48.2%(83例中 40例)로 가장 많았으며 그 다음은 大腸菌群 乳房炎으로 18.1%(83例中 15例)를 차지하였다. 효모양진균에 의한 乳房炎도 10.8%(83例中 9例)나 되었다. Corynebacterium spp.에 의한 乳房炎은 8.4%였으나 연쇄구균성 乳房炎은 3.6%에 지나지 않았다. Bacillus spp.와 pseudomonad에 의한 것은 각각 3.6%와 8.4%이었으며 慢性 乳房炎의 原因菌을 밝힐 수 없었던 것은 4.8%(83例中 4例)이였다.
慢性 乳房炎에 관여한 포도구균과 大腸菌은 供試한 抗菌劑에 대하여 耐性을 나타내는 경향이 뚜렷하였다. 포도구균은 penicillin, methicillin, lincomycin, novobiocin, ampicillin, tetracycline에는 각각 87.2%, 78.7%, 68.1%, 61.7%, 57.4%가 耐性인 반면에 gentamicin, cephalothin, chloramphenicol, erythramycin등에는 각각 787.7%, 76.6%, 74.5%, 63.7%가 感受性이었다.
大腸菌은 streptomycin과 cephalothin에는 72.2%, tetracycline에 66.7%, ampicillin에 61.1%가 耐性인 반면에 colistin, gentamicin, chloramphenicol, neomycin에는 각각 83.3%, 77.8%, 66.7%, 55.6%가 感受性이었다. Corynebacterium spp.는 ampicillin, chloramphenicol, erythromycin, gentamicin, oleandomycin, tetracycline에는 感受性이었으나 novobiocin과 penicillin등에는 耐性이었다. 한편 pseudomonas aeruginosa는 供試한 모든 抗菌劑에 耐性이었다.

다국어 초록 (Multilingual Abstract)

Some investigations on chronic mastitis in dairy cattle in Taegu-Kyungpook Provinces from the beginning of October, 1984 till the end of August, 1985 were conducted with the particular regard to the causative agents and their drug susceptibility. Milk samples from 83 isolated cases of chronic mastitis cattle were investigated bacteriologically and the causative organisms recovered were examined for their antibiotic susceptibility by using disc diffusion susceptibility technique against the major antibiotics of current veterinary use.
Major causative agents involved in chronic mastitis in Taegu-Kyungpook Provinces were in order of prevalence Staphylococcus spp.(48.2%), Escherichia coli(18.1%), Candida spp.(10.8%) and Corynebacterium spp.(8.4%). Streptococcus agalactiae(3.6%), Bacillus cereus(3.6%) and Pseudomonas aeruginosa(2.4%) were found to be one of the minor agents.
The majority of staphylococcal isolates and E.coli were highly resistant to the most antibiotics tested. The percentages of staphylococcal cultures resistant to penicillin, methicillin, lincomycin, novobiocin, ampicillin and tetracycline were 87.2%, 78.7%, 68.1%, 61.7% and 57.4%, respectively, while the majority of them were susceptible to gentamicin(78.7%), cephalothin(76.7%) and chloramphenicol(74.5%), E.coli isolates were found to be highly resistant to streptomycin, cephalothin, tetracycline and ampicillin while the majority of them were susceptible to colistin(83.3%), gentamicin(77.8%) and
chloramphenicol(66.7%), Corynebacterium spp. were susceptible to ampicillin,
chloramphenicol, erythromycin, gentamicin, oleandomycin and tetracycline although they showed resistance to novobiocin and penicillin. Two cultures of Pseudomonas aeruginosa recovered from mastitis milk were highly resistant to the antibiotics employed in the present study.