Trichothecenes are necrotizing mycotoxins produced by molds of the genus Trichothecium and Fusarium. Their presence in feed causes necrosis of the digestive mucosa, especially of the intestinal one. This defoliation, which starts in the duodenum, affects all the intestine and leads to detachment of the epithelium and formation of an orange-ish jelly that is excreted separately from the alimentary bolus. The amount of jelly that can be observed per square meter of litter is indicative of feed's contamination degree.