Our research material involved Mustela neovison mink feed collected at a farm during two feeding seasons: in preparation for animal reproduction and winter fur coat development. The feed was divided into 3 treatment groups – the control with no bentonite supplement and 2 others with dietary sodium bentonite additive at doses of 1% and 1.5% of weighed feed portion. The material was studied for total count of aerobic mesophilic bacteria, total fungal numbers, hemolyzing streptococci, and Salmonella rods. The analyzed material did not show the presence of hemolyzing streptococci or Salmonella rods that evidences good sanitary condition of feed. The highest percentage of microbial reduction was determined in the feed samples obtained from the period of animal preparation for reproduction.