Microbial feed on growth and reproduction, a series of biochemical changes in the feed, resulting in the feed quality deterioration phenomenon known as mildew. Feed mildew will lose the original flavor, no odor, fat acidity increased, destroy the nutrition, palatability decreased.

Because the microorganism itself sends out the smell, so many mold has the strong mildew smell, may be the feed adsorption, this kind of mildew flavour is very difficult to eliminate. Feedstuff mildew often with pest breeding, pest activity metabolite, secretions into will aggravate feedstuff quality deterioration of the situation, causes the discoloration, taste, odor, moisture, caking, mildew and virus and so on a series of deterioration. And the composition of the various organic ingredients in the microbial decomposition of the role of.

Generate many special stimulating olfactory and gustatory substances, such as high moisture feed in poorly ventilated conditions for storage, due to microbial fermentation of dietary carbohydrates, some acid and alcohol, so that the feed belt sour odor and taste.

Severely moldy feed, the protein by microbial decomposition of ammonia, ammonium compound, sulfide, hydrogen sulfide; organic carbon compounds is decomposed produce various organic acids, aldehydes, ketones, the material has a strong irritant, produce peculiar smell and odor, so as to guarantee of suitable feed mouth.