Schukken Y H, Erb H N, Sears P M, Smith R D
Department of Clinical Sciences, New York State College of Veterinary Medicine, Ithaca.
Am J Vet Res. 1988 Jun;49(6):766-9.
An index was developed to measure the proportion of intramammary infections caused by environmental microorganisms on dairy farms. This environmental index can be interpreted as the probability that an intramammary infection was caused by an environmental pathogen, rather than by a contagious pathogen. Using the environmental index as the outcome variable, risk factors for environmental mastitis were studied on 10 dairy farms in New York. Turning the cows outside was associated with lower environmental index, and having cows drink from a stream increased the environmental index. Selective (rather than uniform) nonlactating cow intramammary treatment was related to a lower environmental index (apparently because the farms practicing selective nonlactating cow treatment suffered from epizootics of contagious mastitis).
开发了一个指数来衡量奶牛场中由环境微生物引起的乳房内感染的比例。这个环境指数可以解释为乳房内感染是由环境病原体而非传染性病原体引起的概率。以环境指数作为结果变量，在纽约的10个奶牛场研究了环境性乳腺炎的风险因素。将奶牛放到户外与较低的环境指数相关，而让奶牛饮用溪水会增加环境指数。选择性（而非统一）的非泌乳期奶牛乳房内治疗与较低的环境指数相关（显然是因为实施选择性非泌乳期奶牛治疗的农场遭受了传染性乳腺炎的流行）。
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