Research has been performed on particle size and digestibility in livestock feed but little research has been done on the impact that particle size has in dog food. Dr. Aulus Carciofi and colleagues studied particle size and digestibility of maize, rice, and sorghum. Particle size was categorized as fine, medium, and coarse.
The results concluded that particle size is important for maize and sorghum but not for rice. Rice is easily digested and does not require significant processing, unlike maize and sorghum. The research demonstrated that maize
and sorghum are "dependent on a proper raw material particle size and
need to be appropriately extruded to produce highly digestible foods"
according to Carciofi. Carciofi said, “If properly processed, maize and sorghum are as easily digested as rice-based food." Regarding most pet food manufacturers, Carciofi said they "have only one grinding condition for all recipes, and do not change the extrusion size,based on the type of cereal used."
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