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Field epidemiology to manage BRD risk in beef cattle production systems

  • David R. Smith (a1)

Abstract

Field disease investigations can help to identify patterns of disease that lead to causal hypotheses and, hopefully, effective disease risk management strategies. The most common way of doing this would be to characterize the outbreak by subject, time, and space. One of the perplexing animal health problems on some beef cattle ranches is the occurrence of pneumonia in calves prior to weaning in conditions of little stress and relative isolation. Field investigation of outbreaks of pneumonia in ranch calves prior to weaning has revealed patterns of sporadic illness in calves less than 30 days of age, and rapidly occurring outbreaks in calves 90–150 days of age. We speculate that the causes of these two patterns may be failure of passive transfer resulting in more sporadic cases in very young calves, or a large proportion of the population losing maternal antibody protection (i.e. losing herd immunity) resulting in rapid and widespread onset of pneumonia in older calves.

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Corresponding author

Corresponding author. E-mail: dsmith@cvm.msstate.edu

References

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Gay, JM (2006). Determining cause and effect in herds. Veterinary Clinics of North America, Food Animal Practice 22: 125147.
Hancock, DD and Wikse, SE (1988). Investigation planning and data gathering. Veterinary Clinics of North America, Food Animal Practice 4: 115.
Lessard, PR (1988). The characterization of disease outbreaks. Veterinary Clinics of North America, Food Animal Practice 4: 1732.
Rae, DO (2006). Assessing performance of cow-calf operations using epidemiology. Veterinary Clinics of North America, Food Animal Practice 22: 5374.
Rothman, KJ (1976). Causes. American Journal of Epidemiology 104: 587592.
Sanderson, MW (2006). Designing and running clinical trials on farms. Veterinary Clinics of North America, Food Animal Practice 22: 103123.
Shott, S (2011). Designing studies that answer questions. Journal of the American Veterinary Medical Association 238: 5558.
Smith, DR (2012). Field disease diagnostic investigation of neonatal calf diarrhea. Veterinary Clinics of North America, Food Animal Practice 28: 465481.
USDA (2008). Beef 2007–08, Part I: Reference of Beef Cow-calf Management Practices in the United States, 2007–08. USDA-APHIS-VS, CEAH. Fort Collins, CO #N512–1008.
Waldner, CL and Campbell, JR (2006). Disease outbreak investigation in food animal practice. Veterinary Clinics of North America, Food Animal Practice 22: 75101.

Keywords

Field epidemiology to manage BRD risk in beef cattle production systems

  • David R. Smith (a1)

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