Provided is 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 without undertaking any steps directed at separating any glycerol present； (B) react a prepared distillation by-product with one or more cation source to form at least one reaction product in the form of a hydrated precipitate and where at least one cation in said cation source is not monovalent； such that step (A) results in the prepared distillation by-product ready for step (B), wherein said prepared distillation by-product includes at least one organic acid.
