Mycotoxins are secondary metabolites produced by specific filamentous fungi that infest agricultural commodities. They are known to contaminant crops and consequently animal feeds and animal products, causing significant economic losses associated with their impact on animal health and productivity in agribusiness. In animal production, dramatic acute mycotoxin poisoning with severe or fatal disease is of relatively low prevalence. However, uncertainty and controversy continue to plague livestock producers and health professionals based on real or potential damage to feed efficiency, immune system function, inefficient animal reproduction and possible residues in the human food supply. This book describes conditions that favour mycotoxin formation and consumption, suggesting preventive approaches.