Abstract
When examining biomaterial from tuberculin-reacting pigs, we have isolated 58 cultures of acid-fast mycobacteria, or 7,5 percent of the number of samplesstudied. The rate of cultures isolation from hen biomaterialamounted to 12.5 percent, from synanthropic birds 7.5 percent, from environmental samples 9.4 percent. Resulting from cultural, biochemical and morphological studies, 6 species of atypical mycobacteria were found to persist in the organism of pigs, reacting to avian and mammalian PPD complexes, and in the environment of tuberculosis-free pig-producing farms in Novosibirsk Region. These mycobacteria species belong to 2–4 groups according to the Runyon’s classification, and include M. xenopi, M. avium-intracellulare, M. fortuitum, M. smegmatis, M. phlei, and M. scrofulaceum. Major field isolates from both pig biomaterial and the environment are represented by M. avium-intracellulare complex that indicates their wide distribution. From the samples of various environmental objects, being main sources of mycobacterioses in pigs, were isolated and identified 28 cultures of different species of atypical mycobacteria with M. avium-intracellulare complex prevailed. 
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