SANITARY ASPECTS OF OUTDOOR FARMING SYSTEMS
Outdoor pig farming include free access to outdoor area and wide use of natural resources of soil and plants in which animals can express their natural behavior. Some management practices that may improve welfare such as outdoor rearing, holding in groups, use of bedding or other housing systems in which it is difficult to implement good sanitation may increase risk to exposure of pigs to the pathogens from the environment. Presence of pathogens or their vectors in outdoor areas in combination with poor environmental conditions may result in high prevalence of various infectious or parasitic diseases, many of which may be zoonotic. Difficulties in implementation of common biosecurity measures and health management principles in outdoor farming impede effective control of diseases. Use of breeds or strains which are adapted to harsh environmental conditions and exhibit favorable disease resistance such as local breeds or their crossbreds, appropriate feeding including plants and fungi that have detrimental effect on pathogens (parasites), and grazing management with integrated use of medicaments (anthelmintic) can be additional methods of controlling diseases in outdoor farming. The common health problems in outdoor pig farming system and their potential impact on human health are reviewed in this paper.