Yun Mun-Jo, Yoon Sunghyun, Lee Young Ju
College of Veterinary Medicine & Zoonoses Research Institute, Kyungpook National University, Daegu 41566, Korea.
Gyeongsangbuk-do Provincial Government Office, Andong 36759, Korea.
Animals (Basel). 2020 Sep 2;10(9):1562. doi: 10.3390/ani10091562.
In many countries, bulk tank milk (BTM) has been used for examining milk and analyzed as an important part of milk quality assurance programs. The objectives of this study were to investigate milk quality and the presence of major mastitis pathogens in BTM, and to compare the characteristics of BTM by dairy factory or company. A total of 1588 batches of BTM samples were collected from 396 dairy farms of seven dairy factories owned by four companies in Korea. The means of individual bacterial counts (IBC) and somatic cell count (SCC) were 3.7 × 10 cells/mL and 1.1 × 10 cells/mL, respectively, and no significant differences among dairy factories were observed. The most common pathogen was spp. (60.1%), followed by (53.8%), (37.6%) and spp. (22.5%). spp. showed the highest resistance to tetracyclines (51.1% to 73.9%) and macrolides (46.5%). and coagulase-negative staphylococci (CNS) showed the highest resistance to penicillin (28.4% and 40.2%, respectively), and three (3.2%) and seven (3.3%) CNS were also methicillin-resistant. These data show the diverse prevalence and characteristics of major mastitis pathogens among factories, and support the development of strong monitoring and prevention programs of mastitis pathogens by commercial dairy operations.
在许多国家，散装罐牛奶（BTM）已被用于检测牛奶，并作为牛奶质量保证计划的重要组成部分进行分析。本研究的目的是调查BTM中的牛奶质量和主要乳腺炎病原体的存在情况，并比较不同乳制品厂或公司的BTM特征。从韩国四家公司旗下七家乳制品厂的396个奶牛场共采集了1588批次的BTM样本。个体细菌计数（IBC）和体细胞计数（SCC）的平均值分别为3.7×10⁵个细胞/毫升和1.1×10⁶个细胞/毫升，各乳制品厂之间未观察到显著差异。最常见的病原体是无乳链球菌（60.1%），其次是金黄色葡萄球菌（53.8%）、停乳链球菌（37.6%）和乳房链球菌（22.5%）。无乳链球菌对四环素（51.1%至73.9%）和大环内酯类（46.5%）显示出最高耐药性。金黄色葡萄球菌和凝固酶阴性葡萄球菌（CNS）对青霉素显示出最高耐药性（分别为28.4%和40.2%），并且有三株（3.2%）金黄色葡萄球菌和七株（3.3%）CNS也是耐甲氧西林的。这些数据显示了各工厂主要乳腺炎病原体的不同流行情况和特征，并支持商业乳制品企业制定强有力的乳腺炎病原体监测和预防计划。
