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Samples from the Finnish national feed control programme from 2008 analysed by LC-MS/MS.
| Monensin (mg/kg) | Narasin (mg/kg) | |
|---|---|---|
| Feed 1 | 0.046 | <0.025 |
| Feed 2 | 0.73 | <0.025 |
| Feed 3 | <0.025 | 0.26 |
| Feed 4 | 0.059 | 0.47 |
| Feed 5 | <0.025 | 0.12 |
| Feed 6 | 0.080 | 1.6 |
| Feed 7 | 0.036 | 0.26 |
| Feed 8 | 0.055 | 0.17 |
Lasalocid, maduramicin, and semduramicin were not detected with LC-MS/MS. All samples analysed with HPLC-UV were negative. Lasalocid, maduramicin, and semduramicin were not measured with HPLC-UV.
