A process for preparing at least one animal feed supplement from one or more distillation by-product which includes the following steps in order: A Prepare the or each distillation by-product for processing； B Mix a prepared distillation by-product with one or more cation source； C Dry one or more reaction product； such that step A results in the prepared distillation by-product ready for step B and step B produces the one or more reaction product for step C.
