An epidemiologic view of bovine respiratory disease
Undifferentiated bovine respiratory disease (BRD) is the most economically important disease syndrome of feedlot cattle. Epidemiologic studies have identified management, feeding, and housing factors to be associated with BRD under feedlot conditions. These should help the feedlot manager reduce the frequency of BRD. However, there is a scarcity of epidemiologic data on the pathogenesis of BRD under field conditions. A number of agents, including bacteria (chiefly pasteurellae), viruses (such as IBR, P13, BVD, and BRS), and Mycoplasma (such as M. bovis and M. dispar) have been associated with BRD. Nonetheless, the prevalence and/or role of the agents that cause BRD remain unclear. This sero-epidemiologic study investigates the singular and joint effects of the above agents as determinants of BRD. Preliminary data indicate that most of these agents may paly a direct role in causing BRD. BVD may have only an indirect role mediated by the other viruses, and M. bovis does not appear to influence the occurrence of BRD
Main Authors: | , , , , , , , , |
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Format: | biblioteca |
Published: |
East Lansing, Mich. (EUA)
1987
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Subjects: | ENFERMEDADES RESPIRATORIAS, GANADO BOVINO, EPIDEMIOLOGIA, |
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Summary: | Undifferentiated bovine respiratory disease (BRD) is the most economically important disease syndrome of feedlot cattle. Epidemiologic studies have identified management, feeding, and housing factors to be associated with BRD under feedlot conditions. These should help the feedlot manager reduce the frequency of BRD. However, there is a scarcity of epidemiologic data on the pathogenesis of BRD under field conditions. A number of agents, including bacteria (chiefly pasteurellae), viruses (such as IBR, P13, BVD, and BRS), and Mycoplasma (such as M. bovis and M. dispar) have been associated with BRD. Nonetheless, the prevalence and/or role of the agents that cause BRD remain unclear. This sero-epidemiologic study investigates the singular and joint effects of the above agents as determinants of BRD. Preliminary data indicate that most of these agents may paly a direct role in causing BRD. BVD may have only an indirect role mediated by the other viruses, and M. bovis does not appear to influence the occurrence of BRD |
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