Determination of authorised coccidiostats in poultry compound feed: EURL Feed Additives Control, Proficiency test exercise 2012

The European Union Reference Laboratory for Feed Additives Control (EURL-FA Control) has been mandated by the Directorate General for Health and Consumers (DG SANCO) to organise a Proficiency Test exercise (PT) among appointed National Reference Laboratories (NRLs) in order to assess their capacity to correctly determine the 11 authorised coccidiostats in feed matrices. This report presents the results of the PT. Thirty laboratories from 22 countries registered to the exercise. Laboratory results were rated using z- and ζ-scores (zeta-scores). Between 62% and 73 % of the laboratories reported satisfactory results for four of the five spiked measurands, namely monensin, lasalocid, diclazuril and salinomycin. For the fifth spiked one, narasin, only 57 % of the laboratories submitted satisfactory results. The laboratories also reported qualitative results as regards to the presence of one or more of the other authorised coccidiostats. On the whole, the rate of false positive results was 3% for monensin and narasin, 4% for robenidine, 7% for lasalocid and 0% for all the others.JRC.D.5-Standards for Food Bioscienc