Abstract: An insufflator assembly, comprising: an insufflator comprising a delivery component (1) for delivering powder into an airway of an animal, a metering component (3) for providing a dose of powder (P) to the delivery component (1) and an inlet for receiving a stream of gas; and means for providing a stream of gas to the inlet of the insufflator so as to carry the dose of powder (P) into the airway of the animal, the means comprising a chamber (45) of a predetermined volume for containing gas at a predetermined pressure above atmospheric, a pressurized gas source (9) for providing gas of a predetermined pressure to the chamber (45), a first valve (47) for selectively connecting the chamber (45) to the pressurized gas source (9) and a second valve (49) for selectively connecting the chamber (45) to the inlet of the insufflator.

Abstract: In a method for measuring a dose of a drug inhaled by an animal, the momentary concentration of the drug in an aerosol supplied to the animal and the momentary inhalation flow rate of the animal are determined. An inhaled partial dose is calculated from each determined inhalation flow rate value and a corresponding concentration value. The calculated inhaled partial doses are added to obtain the total dose inhaled by the animal.