Using scenario tree modelling for targeted herd sampling to substantiate freedom from disease

BMC Veterinary Research

Table 3 Comparison of costs for the annual serological survey to substantiate freedom from IBR and EBL using conventional stratified random sampling (sRS) and combined targeted and baseline stratified random sampling (cTS&bsRS) (figures based on data by S. Menéndez, Swiss Federal Veterinary Office (2008), exchange ratio CHF/€ = 1.5)

	Number of herds to be tested	Number of individual blood samples	Costs for the planning of the survey	Costs for sampling and laboratory analysis	Total costs for the full survey⁵
IBR
sRS	2,259	45,180¹	8,700 €	912,000 €	964,800 €
cTS&bsRS	1,241	25,650²	11,800 €³	524,500 €	580,600 €
*EBL*
sRS	2,243	44,860¹	8,700 €	903,100 €	955,900 €
cTS&bsRS	1,750	41,160²	11,800 €³	824,000 €	880,100 €

¹ The average number of animals to be tested (eq. individual samples) per farm was set at 20 for randomly selected farms.
² The average number of animals to be tested (eq. individual samples) per farm was set at 30 for farms selected targeted and at 20 for farms selected randomly (baseline sample).
³Additional administrative expenses for updating of "risk farms".
⁴ The costs include farm visits, sampling labour and material, shipment/postage expenses and laboratory costs.
⁵ The costs for the evaluation and reporting of the survey results do not differ between the two methods and are therefore not mentioned separately in the table, but are included in the total costs of the survey.

ISSN: 1746-6148