Whist Anne Cathrine, Osterås Olav, Sølverød Liv
Department of Production Animal Clinical Sciences, Norwegian School of Veterinary Science, PO Box 8146 Dep., 0033 Oslo, Norway.
J Dairy Res. 2007 Feb;74(1):1-8. doi: 10.1017/S0022029906002135. Epub 2006 Sep 15.
The objective was to promote a reduction in the prevalence of Staphylococcus aureus and Streptococcus dysgalactiae after 2 years of selective dry cow therapies and teat dipping/external teat sealant implementation. Three different dry cow treatments, one long-acting and two short-acting penicillin-based products were tested at herd level together with a negative control teat dipping group, an iodine teat dipping group and DryFlextrade mark, an external teat sealant. The regimes were independently randomly allocated to 178 dairy herds. Yearly bacteriological quarter milk samples were collected from all cows at the beginning of the trial, after 1 year and 2 years. At herd level, a total of 15% of the herds showed no Staphylococcus aureus isolates after 2 years, compared with 5% at the beginning. The distribution of Streptococcus dysgalactiae infected herds remained the same after 2 years. At cow level, there were no significant differences in the reduction of Staph. aureus between the different dry cow therapies and teat dipping regimes. But there was a significant reduction of Str. dysgalactiae in the iodine teat dipping group compared with Dryflextrade mark and the negative control group. The proportional rate of Staph. aureus positive quarters was reduced from 65.9% to 54.9% after 2 years. As for Str. dysgalactiae, an increase was observed from 14.2% to 15.2%.
目的是在实施选择性干奶牛疗法和乳头药浴/外部乳头封闭剂两年后，促使金黄色葡萄球菌和停乳链球菌的流行率降低。在牛群水平上测试了三种不同的干奶牛处理方法，一种长效和两种短效的基于青霉素的产品，同时设置了一个阴性对照乳头药浴组、一个碘乳头药浴组以及一种外部乳头封闭剂DryFlex商标产品。这些方案被独立随机分配到178个奶牛场。在试验开始时、1年后和2年后，每年从所有奶牛身上采集季度细菌学乳样。在牛群水平上，两年后共有15%的牛场未分离出金黄色葡萄球菌，而试验开始时这一比例为5%。两年后，感染停乳链球菌的牛场分布保持不变。在奶牛个体水平上，不同的干奶牛疗法和乳头药浴方案在金黄色葡萄球菌减少方面没有显著差异。但与Dryflex商标产品组和阴性对照组相比，碘乳头药浴组的停乳链球菌显著减少。两年后，金黄色葡萄球菌阳性乳区的比例从65.9%降至54.9%。至于停乳链球菌，观察到其比例从14.2%增加到15.2%。
