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  • Author or Editor: Huybert Groenendaal x
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Abstract

Objective—To evaluate the epidemiologic efficacy and economic efficiency of current and potential future control programs for paratuberculosis (Johne's disease) on midsize dairy herds in the United States.

Design—Stochastic dynamic computer simulation model.

Sample Population—Data on prices and other input variables collected from various sources were used to represent a population of midsize US dairy herds infected with paratuberculosis.

Procedure—The simulation model was modified to reflect management and production characteristics of midsize dairy herds in the United States. The model was validated by use of field data and expert opinion. Various control strategies then were simulated and compared on an epidemiologic basis and on the basis of economic efficiency.

Results—Test-and-cull strategies and vaccination against paratuberculosis were not able to decrease the mean prevalence of disease in the United States. Typically, only vaccination was economically attractive. Improved management strategies decreased the prevalence of paratuberculosis considerably and had high economic benefits.

Conclusions and Clinical Relevance—Analysis of results of this study suggests that test-and-cull strategies alone do not reduce the prevalence of paratuberculosis in cattle and are costly for producers to pursue. Vaccination did not reduce the prevalence but was economically attractive. Finally, improved calf-hygiene strategies were found to be critically important in every paratuberculosis control program and most were economically attractive programs for midsize US dairy farms with the disease. (J Am Vet Med Assoc 2003;223:1757–1763)

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in Journal of the American Veterinary Medical Association

Abstract

Objective—To evaluate farm-level economic costs and benefits related to control of paratuberculosis (Johne's disease) in dairy herds in the National Johne's Disease Demonstration Herd Project (NJDDHP).

Design—Economic analysis.

Sample Population—40 dairy herds enrolled in the NJDDHP.

Procedures—A farm-level economic analysis of the US NJDDHP was performed. Costs and benefits of management-related practices to control Johne's disease were estimated on the basis of results for 40 dairy operations enrolled in the project. From these costs and benefits, the net present value (NPV) for control of Johne's disease was estimated.

Results—Analysis revealed a mean NPV of $34/animal (equivalent to approx $3/animal/y) when there were no testing costs for producers and a mean NPV of −$14/animal when testing costs were borne by the producers.

Conclusions and Clinical Relevance—Management-related practices to control Johne's disease were typically found to be of marginal economic benefit when the costs of testing were not borne by producers. The continuation of the NJDDHP for another 2 to 4 years would allow more precise estimation of the economic benefits of a control program for Johne's disease.

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in Journal of the American Veterinary Medical Association