1. Dry anti-mildew method. The warehouse where the feed is stored must be dry. The bottom of the feed should have a 15 to 20 cm high bottom, and there should be gaps above and around to keep the air flowing. 2. Hypoxia anti-mildew law. The feed is sealed and stored in plastic bags. The respiration of microorganisms causes the oxygen in the bags to inhibit the reproduction of molds. 3. Acetic acid anti-mildew method. With 2 parts of acetic acid and 1 part of sodium acetate, then add 1% sorbitol, stir well, dry and add it into the feed at a proportion of 1%. This method can ensure that the feed will not mold for 2 months. 4. Calcium propionate (sodium) anti-mildew method. 100 g of sodium propionate is added per 100 kg of feed. The practice is to first mix a small amount of feed with sodium propionate, then add a large amount of feed, and mix evenly in a dry cement pool or plastic bag. This method can prevent mold for more than 100 days. 5. Ke mold net anti-mildew law. Add 0.5 kg of Gram-needling to each ton of chicken feed, or add 2 to 3 kg of Kemyme to each ton of piglet concentrated feed. This method can prevent mildew for about 2 months. 6. ammonia anti-mold law. Put the logs on the dry ground, and stack the layers of hay. Place 7 to 9 layers of plastic and cover it with plastic film. Use air pump to inject ammonia into the haystack. For grasses with 30% to 35% water content, 2% ammonia is injected; for grasses with less than 30% water content, 1% ammonia is injected. This law applies to the reserves of hay.