A method of drying feedstuff samples without substantially altering their composition is provided. The method includes placing feedstuff samples in one or more porous enclosures, such as bags. The enclosures allow for airflow to pass through them to the samples within without allowing said samples to escape. Enclosures holding the feedstuff samples are placed in a dryer. Multiple porous enclosures may be placed in the dryer concurrently. The dryer then subjects the feedstuff samples in the enclosures to heated airflow and rotational movement/tumbling to adjust the moisture content of the feedstuff samples. The heated air of the dryer has a temperature and airflow rate of at least 50 degrees Celsius and 500 CFM, respectively. Moreover, the rotational movement within the dryer has a rate of at least 40 RPM. The resulting dried samples have approximately 10% or less moisture remaining after 45 to 180 minutes in the dryer.
