The probability of having multi-contamination of mycotoxins in one raw material sample is very high, as shown in many studies. In the field, favourable conditions of development of one mould often permits the development of other mould species. In addition, one mould can produce different types of mycotoxins. The most frequent type of mould developing on plants in the field is Fusarium, responsible for Fusariosis. As for all fungi, Fusarium growth depends on moisture level, temperature, resistance of grain varieties and cultivation methods like crop rotation, no-till farming or the application of fungicides. The mould itself is not a high threat to the animal, but its toxins, produced under stressful conditions, are. Fusarium specifically produces fusariotoxins: trichothecenes (deoxynivalenol (DON) and T-2/HT-2 mainly), zearalenone (ZEA) and fumonisins (FUM). The different parameters affecting mould growth and mycotoxin production are responsible for the variable occurrence of fusariotoxins depending on the feed materials, as shown in several publications (SCOOP 2003; Eckard et al. 2011; De Boevre et al. 2013).