The growth promoter Thiouracil accounted for one third (17) of all non-compliant residue test results, while excess anthelmintic residues made up another third (18) of failed samples in 2017.

Latest figures from a Department of Agriculture report show an otherwise high level of compliance across all sectors, with just 0.3% of samples (51) non-compliant.

Where growth promoters were detected, a followup investigation was launched by the Department. In all 17 cases, they it concluded no illegal administration had taken place.

Diets rich in brassicas

Instead, it is was determined that feeding diets rich in brassicas, such as kale or rape, could result in low levels of Thiouracil being detected.

Residues of authorised veterinary medicines in excess of maximum residue limits (MRLs) were found in a total of 22 samples, but no harmful food stuff entered the food chain.

Residues of anthelmintics accounted for 18 of those samples. The Department said this indicated that specified post-treatment withdrawal periods had not been observed or incorrect administration had occurred.

Tests for residues and illegal medicines shows 99.7% compliance

Growth promoters and incorrect dose usage main reasons for failed residue tests

While the overall level of compliance across all major food-producing sectors was very high, two major issues resulted in non-compliant residue samples.