The aim of our work was to assess the main way of complex preventive measures to minimise the potential disease-causing microorganisms in 41 sheep farms with emphasis on animal health and product quality. There was collected and analysed a complex of preventive measures designed to prevent the penetration of infectious agents into animals by persons, animals, technological systems and equipment, transport, and the point of farm sanitation was also taken into consideration. Biosecurity as an integral part of herd health management can significantly help to reduce the negative effect of rearing environment factors. The infection pressure in farms and in stables proportionally increases with animal concentration, duration of their stay in the stable during winter housing. An appropriate hygiene standard of the breed is a prerequisite for achieving high levels of production and reproductive performance of farmed sheep and economic viability of farmers.