East N E, Birnie E F, Farver T B
Am J Vet Res. 1987 May;48(5):776-9.
Prevalence of intramammary infection in healthy goats was determined from 4,662 composite udder samples taken over a 9-month period. For each doe, a colostral sample and 2 milk samples were collected. Breed, age, number of days not lactating before kidding, number of lactation days, and kidding date were recorded. Coagulase-negative Staphylococcus spp were isolated from 17.5% of does, Staphylococcus aureus from 3.1%, Mycoplasma spp from 1.2%, Streptococcus spp from 0.3%, and gram-negative bacteria from 2.0%. Gram-negative organisms were associated with intermittent infections, whereas coagulase-negative staphylococci were associated with persistent infections. Intramammary infection was related to breed, number of days not lactating, and number of lactation days, as determined by log-linear analysis. Does of the Nubian breed, does with nonlactating periods of greater than 60 days, and does in the first and last third of a standard 305-day lactation appeared to be at higher risk for intramammary infection.
通过在9个月期间采集的4662份混合乳房样本，确定了健康山羊乳房内感染的患病率。对于每只母羊，采集了一份初乳样本和两份乳汁样本。记录了品种、年龄、产羔前非泌乳天数、泌乳天数和产羔日期。凝固酶阴性葡萄球菌属从17.5%的母羊中分离出来，金黄色葡萄球菌从3.1%中分离出来，支原体属从1.2%中分离出来，链球菌属从0.3%中分离出来，革兰氏阴性菌从2.0%中分离出来。革兰氏阴性菌与间歇性感染有关，而凝固酶阴性葡萄球菌与持续性感染有关。通过对数线性分析确定，乳房内感染与品种、非泌乳天数和泌乳天数有关。努比亚品种的母羊、非泌乳期超过60天的母羊以及处于标准305天泌乳期的前、后三分之一阶段的母羊，似乎发生乳房内感染的风险更高。
