Study of the persistence of carry-over at feed plants

In 2009, a European directive (directive 2009/8/CE) laid down limits on the levels of coccidiostats present in animal feeds, corresponding to carry-over levels of 1% to 3% of maximum permissible values. In France, feed plants only perform a single carry-over (CO) test with at least 2 collector batches, and there is no guarantee that this type of test clearly identifies the number of batches required to cross, one by one, the “discharging” levels of the bans on producing such or such feedstuff.