title: Efficiency of risk-based vs . random sampling for the monitoring of tetracycline residues in slaughtered calves in Switzerland.
abstract: In all European Union countries, chemical residues are required to be routinely monitored in meat. Good farming and veterinary practice can prevent the contamination of meat with pharmaceutical substances, resulting in a low detection of drug residues through random sampling. An alternative approach is to target-monitor farms suspected of treating their animals with antimicrobials. The objective of this project was to assess, using a stochastic model, the efficiency of these two sampling strategies. The model integrated data on Swiss livestock as well as expert opinion and results from studies conducted in Switzerland. Risk-based sampling showed an increase in detection efficiency of up to 100% depending on the prevalence of contaminated herds. Sensitivity analysis of this model showed the importance of the accuracy of prior assumptions for conducting risk-based sampling. The resources gained by changing from random to risk-based sampling should be transferred to improving the quality of prior information.
authors.affiliation: Federal Veterinary Office, 3003 Bern, Switzerland. patrick.presi@bvet.admin.ch
authors.forename: Patrick
authors.initials: P
authors.lastname: Presi
authors.forename: Katharina D C
authors.initials: KD
authors.lastname: Stark
authors.forename: Lea
authors.initials: L
authors.lastname: Knopf
authors.forename: Eric
authors.initials: E
authors.lastname: Breidenbach
authors.forename: Moez
authors.initials: M
authors.lastname: Sanaa
authors.forename: Joachim
authors.initials: J
authors.lastname: Frey
authors.forename: Gertraud
authors.initials: G
authors.lastname: Regula
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis*; D002417:Cattle; D004350:Drug Residues / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D008460:Meat / Q000032:analysis*; D008954:Models, Biological; D011897:Random Allocation; D012307:Risk Factors; D013557:Switzerland; D013752:Tetracycline / Q000032:analysis*
chemical_list: D000900:Anti-Bacterial Agents; D013752:Tetracycline