Abstract: The present invention relates to a preferably computer-implemented method of raising a group of monogastric animals Issues such as exposure of the animals to an initiator of a disease are recognized at an early stage by ex vivo analysis of blood samples. Said analysis is done where the animals are raised using point-of-care devices. Accuracy of separation between affected and non-affected animals is increased by measuring a set of pre-determined blood parameters. The landless monogastric animal production system of the invention facilitates implementation of the method of the invention.