An experiment was conducted to investigate the effects of storage type and inclusion of antifungal agent (sodium propionate) on microbial profile of feed ingredients commonly used in pig diets. Total of six feed ingredients (corn, wheat, soybean meal (SBM), corn DDGS, fish meal and poultry by-products) were stored in granary or feed bin with or without antifungal agent (0.30% sodium propionate) for 8 weeks period and microbial profile were investigated at the beginning of the experiment (week 0) and at 2, 4, 6 and 8 weeks of

storage. At the beginning of the experiment, microbial profile of all feed ingredients were not different ( p>0.05) among ingredients stored in granary or feed bin with or without sodium propionate. Irrespective of storage type and addition of sodium propionate, salmonella was not detected in any of all feed ingredient during 8

weeks of storage period. Inclusion of sodium propionate reduced ( p<0.05) populations of staphylococci in corn (2, 4, 6 and 8 weeks), wheat (8 week), SBM, DDGS, fish meal and poultry by-product (4, 6 and 8 weeks). Clostridia populations were reduced ( p<0.05) in sodium propionate added corn, SBM, DDGS, fish meal, poultry by-products (4, 6 and 8 weeks) and wheat (6 and 8 weeks). Coliforms populations were reduced ( p<0.05) in all sodium propionate added ingredients at 2, 4, 6 and 8 weeks of storage, whereas the inclusion of sodium propionate reduced total anaerobic bacteria in fish meal, (2, 4, 6 and 8 weeks), poultry by-product (2 and 4 weeks), SBM (4 and 6 weeks) and corn, wheat, DDGS (4, 6 and 8 weeks).Yeast and mold count were reduced ( p<0.05) in wheat, SBM, DDGS, fish meal and poultry by-products (week 4, 6, and 8) and corn (week 6 and 8). However, storage type (granary vs. feed bin) had no effects ( p>0.05) on populations of staphylococci, clostridia, coliforms, total bacterial count, yeast and mold counts during any storage period. The results obtained in the present study indicated that microbial profile of feed ingredients was not affected by storage type (granary vs. feed bin), but the inclusion of sodium propionate improved the microbial profile of all feed ingredients commonly used in pig diets.