The article is devoted to the question of peculiarity of bronchopulmonary system's pathology in the workers of the animal fodder production. The production dust contains high concentrations of endotoxins and leads to the development of allergic reactions and diseases of respiratory system. The ODTS (organic dust toxic syndrome) revealed as an acute reaction of organism in (39.7 +/- 4.4) % workers of the 1st plant and in (14.7 +/- 6.0) % of the 2nd one. Among chronic diseases predominates chronic bronchitis: (26.4 +/- 4.0) % at the I and (8.8 +/- 4.8) % at the II plants. We propose to use the obstruction of little bronchi and bronchial hyperresponsivennes as early diagnostical criterions of the influence of organic dust.