Certain long-term supply formulations of complementary feed for particular nutritional purposes with a high concentration of trace elements unavoidably contain amounts of arsenic, cadmium or lead exceeding the maximum levels established for these heavy metals in complementary feed. Higher maximum levels for these heavy metals in long-term supply formulations do not, however, entail a risk for animal or public health or the environment as the exposure of the animals to the heavy metals by making use of these specific long-term supply formulations is significantly lower than in the case of other complementary feeds containing trace elements. Therefore it is appropriate to establish higher maximum levels for those heavy metals for such long- term supply formulations, containing high levels of trace elements.