Bruno Daniela R, Tonooka Karen H, Lehenbauer Terry W, Aly Sharif S, ElAshmawy Wagdy R
Cooperative Extension, University of California Agriculture and Natural Resources, Fresno, CA 93710, USA.
Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California Davis, Tulare, CA 93274, USA.
Vet Sci. 2025 Jun 21;12(7):609. doi: 10.3390/vetsci12070609.
Bovine mastitis is a significant disease affecting dairy cattle worldwide, impacting milk quality and farm profitability. Understanding pathogen distribution is crucial for effective disease management. This study analyzed 319,634 individual cow milk samples submitted to the UC Davis Milk Quality Laboratory between 2009 and 2023 to assess pathogen prevalence, seasonal variations, and long-term trends. Routine microbiological cultures identified major and minor mastitis pathogens, with additional testing for spp. Statistical analyses evaluated annual and seasonal trends in bacterial isolation rates. Results indicated that environmental pathogens, particularly non-aureus staphylococci and coliforms, were most frequently isolated, while contagious pathogens (, , and spp.) were less prevalent. Seasonal trends revealed higher contamination rates in Winter and increased no-growth samples in Summer. The study also observed a decline in sample submissions in recent years, possibly reflecting evolving dairy management practices. These findings provide a comprehensive perspective on mastitis pathogen dynamics in California's Central Valley, supporting improved milk quality control measures and tailored mastitis prevention strategies.
牛乳腺炎是一种影响全球奶牛的重要疾病，会影响牛奶质量和农场盈利能力。了解病原体分布对于有效的疾病管理至关重要。本研究分析了2009年至2023年间提交给加州大学戴维斯分校牛奶质量实验室的319,634份个体奶牛牛奶样本，以评估病原体流行情况、季节性变化和长期趋势。常规微生物培养确定了主要和次要的乳腺炎病原体，并对 spp. 进行了额外检测。统计分析评估了细菌分离率的年度和季节性趋势。结果表明，环境病原体，特别是非金黄色葡萄球菌和大肠菌群，最常被分离出来，而传染性病原体（、和 spp.）则不太常见。季节性趋势显示冬季污染率较高，夏季无生长样本增加。该研究还观察到近年来样本提交量有所下降，这可能反映了不断演变的奶牛管理实践。这些发现为加利福尼亚中央山谷乳腺炎病原体动态提供了全面的视角，支持改进牛奶质量控制措施和量身定制的乳腺炎预防策略。
