Click on a headline below to view the desired abstract. The print version    opens all abstracts at once. Use of by-products with regard to sustainable development Utilization of by-products in animal nutrition - from its beginning up to the white paper of food safety Development of a methodical algorithm for calculation of regional available by-products, exemplarily shown for the Federal State of Saxony Official control of hygienic conditions for preparing by-products of animal origin as feedstuffs Mycotoxins in by-products of cereal processing industry       S. Dänicke Institut für Tierernährung, Bundesforschungsanstalt für Landwirtschaft (FAL), Bundesallee 50, D-38116 Braunschweig Abstract Based on a literature review, it was demonstrated that wheat bran is often more highly contaminated with deoxynivalenol (DON) and zearalenone (ZON) than the original wheat due to higher mycotoxin concentrations in the outer layers of the wheat grain. This is also due to the fact that dust from wheat cleaning is added finally to the bran. Model calculations revealed that care must be taken if contaminated wheat or bran produced from it are used in feeding of pigs, especially in so-called "mycotoxin-years" where higher concentrations of DON and ZON can be expected than in "normal" years.   Schlussfolgerungen Höhere DON- und ZON-Konzentrationen in den äußeren Kornschichten kontaminierter Weizenkörner können in den daraus hergestellten Kleien zu einer Toxinanreicherung führen. Hinzu kommt, dass dem Getreidekorn oberflächlich anhaftende Mykotoxine, die bei der Getreidereinigung vom Korn entfernt werden, anschließend der Kleie wieder zugeführt werden, wodurch eine weitere Toxinanreicherung in der Kleie erfolgt. Bei Einsatz höherer Kleieanteile in der Schweinefütterung sollte daher die DON- und ZON-Konzentration überwacht werden, um Schäden vom Tier fern zu halten. Dioxins in feedingstuffs Heavy metals in by-products of plant and animal origin