A method of producing an animal feed product from a wet biological material, having a physical form selected from solutions, suspensions, emulsions, gums, mousses, sludges, slurries, and particulate materials, includes the step of combining the biological material with a base comprising a metal oxide in an amount which is sufficient to heat the biological material to a temperature of above 50°C by reaction of water in the biological material with the metal oxide to produce the animal feed product. The product has a physical form which is easier to handle than that of the wet biological material and is selected from particulate materials and, granular materials. The base is preferably calcium oxide.
