Abstract: The present document discloses a method of processing a sample obtained from a livestock animal, comprising applying at least some of said milk to a test surface of a growth medium test plate, waiting for a time sufficient to allow microbial growth to form on said test surface, acquiring a visual spectrum image depicting at least part of the test surface, using an image capture device, and providing a computer-implemented pre-trained image classifier algorithm, said image classifier algorithm being pre-trained to determine a microorganism type based on a visible spectrum image depicting a growth pattern of a known microorganism, and applying said image to the pre-trained image classifier algorithm to determine a microorganism type based on a microorganism growth pattern visible on the image.