tIn order to establish the influence of the drying air characteristics on the drying performance and fluidization qualityof bovine intestine for pet food, several drying tests have been carried out in a laboratory scale heat pump assisted fluidbed dryer. Bovine intestine samples were heat pump fluidized bed dried at atmospheric pressure and at temperaturesbelow and above the materials freezing points, equipped with a continuous monitoring system. The investigation ofthe drying characteristics have been conducted in the temperature range −10 to 25◦C and the airflow in the range1.5–2.5 m/s. Some experiments were conducted as single temperature drying experiments and others as two stagedrying experiments employing two temperatures. An Arrhenius-type equation was used to interpret the influenceof the drying air temperature on the effective diffusivity, calculated with the method of slopes in terms of energyactivation, and this was found to be sensitive to the temperature. The effective diffusion coefficient of moisturetransfer was determined by the Fickian method using uni-dimensional moisture movement in both moisture, removalby evaporation and combined sublimation and evaporation. Correlations expressing the effective moisture diffusivityand drying temperature are reported.Bovine particles were characterized according to the Geldart classification and the minimum fluidization velocitywas calculated using the Ergun Equation and generalized equation for all drying conditions at the beginning and endof the trials. Walli’s model was used to categorize stability of the fluidization at the beginning and end of the dryingfor each trial. The determined Walli’s values were positive at the beginning and end of all trials indicating stablefluidization at the beginning and end for each drying condition.