Poutrel B, Rainard P
J Dairy Sci. 1981 Feb;64(2):241-8. doi: 10.3168/jds.S0022-0302(81)82560-X.
California Mastitis Test scores and bacteriological analysis of quarter foremilk samples from 133 cows of three herds were used to determine which quarters or cows to treat in a selective dry cow therapy program. Effect of score, week of the test, and type and number of intramammary infections were examined. Score was independent of the type of intramammary pathogen infection. When all positive reactions were considered, approximately 80% of the infections by major pathogens were diagnosed on a single milk sample taken at either 8 or 4 wk before drying off. At 8 and 4 wk, 13 and 23% of samples from uninfected quarters or quarters infected with minor pathogens had positive reactions. Selective treatment of all cows that had one or more positive quarters led to treatment of twice as many quarters than if only positive quarters were treated. The most discriminating, simplest, and economic method of selective treatment was one test on quarter foremilk samples collected 8 wk before the expected dry-off and dry treatment of all positive mammary quarters.
利用来自三个牛群的133头奶牛的四分体前乳样本的加利福尼亚乳房炎检测分数和细菌学分析，来确定在选择性干奶治疗方案中要治疗哪些四分体或奶牛。研究了分数、检测周数以及乳房内感染的类型和数量的影响。分数与乳房内病原体感染的类型无关。当考虑所有阳性反应时，大约80%的主要病原体感染是在干奶前8周或4周采集的单个乳样上诊断出来的。在8周和4周时，来自未感染四分体或感染次要病原体的四分体的样本分别有13%和23%呈阳性反应。对所有有一个或多个阳性四分体的奶牛进行选择性治疗，导致治疗的四分体数量是仅治疗阳性四分体时的两倍。最具鉴别力、最简单且经济的选择性治疗方法是在预期干奶前8周采集四分体前乳样本进行一次检测，并对所有阳性乳房四分体进行干奶治疗。
