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

Bibliographic Details

Main Authors:	115707 Sandals, D., 49640 Bohac, J.G., 90734 Martin, S.W., 113459 Rosendal, S., 91668 Mather, E.C., 82201 Kaneene, J.B. eds., 13452 Michigan State Univ., East Lansing, Mich. (EUA), 13258 Kellogg Foundation, Battle Creek, Mich. (EUA), 34388 Conference on Economics of Animal Diseases Battle Creek, Mich. (EUA) 23-25 Jun 1986
Format:	biblioteca
Published:	East Lansing, Mich. (EUA) 1987
Subjects:	ENFERMEDADES RESPIRATORIAS, GANADO BOVINO, EPIDEMIOLOGIA,
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