The present invention relates to a process for the production of a bacterially enriched animal feed composition. The process comprises the steps of a) providing a proteinaceous feed material to be fermented； b) providing an inoculum comprising bacteria, and wherein the concentration of bacteria in the inoculum of step b) is sufficient to outgrow any bacteria, yeast or moulds present in the proteinaceous feed material of step a)； c) combining the materials of steps a) and b) and fermenting the proteinaceous feed material of step a) using the inoculums of step b), thereby providing a fermented proteinaceous feed material； and d) adding methanotrophic bacteria to the fermented proteinaceous feed material to provide a bacterially enriched animal feed composition.
