Bodoh G W, Pearson R E, Schultze W D, Miller R H
J Dairy Sci. 1981 Jan;64(1):123-9. doi: 10.3168/jds.S0022-0302(81)82536-2.
Sources of variation in the Wisconsin Mastitis Test were studied in 4739 bucket milk samples from 111 cows in one herd during 103 days. Quarters of cows were classified infected or uninfected through bacteriologic assays of quarter milk samples. Quarters were uninfected in 70.4% of the cow-quarter-days and infected with Staphylococcus aureus and Streptococcus agalactiae in 1.4 and .9% of the quarter samples. Scores of all cow-days averaged 8.5. Wisconsin Mastitis Test scores of cow-days having no pathogens averaged 5.8. Correlation of duplicate samples was .97. Repeatability of monthly tests was .67. Days within month of lactation, month within age group, cow within age, and age differed. Older cows averaged higher Wisconsin Mastitis Test scores. Scores for uninfected cow-days did not differ with age. Scores were higher by 5.5 units in cows with infected quarters than in those with no infected quarters. The increase was greater with S. aureus or S. agalactiae present than with less virulent pathogens. In a cost-utility analysis, Wisconsin Mastitis Test was inefficient in detecting infected cows with a single test.
在103天内，对来自一个牛群中111头奶牛的4739份桶奶样本进行了威斯康星乳房炎检测变异来源的研究。通过对每个乳区奶样进行细菌学检测，将奶牛的各个乳区分成感染或未感染两类。在70.4%的奶牛-乳区-天数中，乳区未感染，在1.4%和0.9%的乳区样本中分别感染了金黄色葡萄球菌和无乳链球菌。所有奶牛日的评分平均为8.5。无病原体的奶牛日的威斯康星乳房炎检测评分平均为5.8。重复样本的相关性为0.97。每月检测的重复性为0.67。泌乳月内的天数、年龄组内的月份、年龄内的奶牛以及年龄均有所不同。年龄较大的奶牛威斯康星乳房炎检测评分平均较高。未感染奶牛日的评分在不同年龄间没有差异。有感染乳区的奶牛的评分比无感染乳区的奶牛高5.5分。与毒性较弱的病原体相比，存在金黄色葡萄球菌或无乳链球菌时评分增加幅度更大。在成本效益分析中，单次威斯康星乳房炎检测在检测感染奶牛方面效率低下。
