To be able to document and trace contaminated feed, samples from each batch of feed should be retained for several months after purchase. These samples should also be labeled as to when they were delivered, and by whom. This allows you to investigate food-borne diseases that may be difficult to diagnose after the feed has been consumed.

Feed that animals refuse should be inspected and the reason for lack of palatability should be determined and corrected.

Feed storage areas should be kept free of vermin. Fly and bird control should be practiced to limit the potential introduction and spread of diseases.