Ryan D P, Greenwood P L, Nicholls P J
New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, Camden, Australia.
J Dairy Res. 1993 Aug;60(3):299-306. doi: 10.1017/s0022029900027643.
Bacteriology, somatic cell counts (SCC) and N-acetyl-beta-glucosaminidase (NAGase) activity determinations were conducted on milk samples collected from does in three dairy herds with caprine arthritis-encephalitis virus (CAEV) infection. In two herds, CAEV-infected does were more likely to have a subclinical bacterial infection of the udder than CAEV-free does (P < 0.05). Does with CAEV but no bacterial udder infection had significantly greater mean SCC and NAGase activity than CAEV-free does without udder infection (P < 0.01). In two herds, changes in milk SCC and NAGase associated with CAEV infection were similar to those produced by coagulase-negative staphylococcal infections. The findings confirm that indirect indicators of bacterial mastitis infection may have reduced specificity in dairy goat herds with CAEV.
对从三个感染山羊关节炎-脑炎病毒（CAEV）的奶牛场的母羊采集的牛奶样本进行了细菌学、体细胞计数（SCC）和N-乙酰-β-葡萄糖苷酶（NAGase）活性测定。在两个牛群中，感染CAEV的母羊比未感染CAEV的母羊更有可能发生隐性乳房细菌感染（P<0.05）。患有CAEV但无乳房细菌感染的母羊的平均SCC和NAGase活性显著高于未感染CAEV且无乳房感染的母羊（P<0.01）。在两个牛群中，与CAEV感染相关的牛奶SCC和NAGase变化与凝固酶阴性葡萄球菌感染所产生的变化相似。这些发现证实，在感染CAEV的奶山羊群中，细菌性乳腺炎感染的间接指标可能特异性降低。
