1. Insect pests, mites and rodents in feed. 1 Insect pests: The feed is often eroded by insect pests during storage, resulting in the loss of nutrients or the production of toxins. 2 螨 Harmful: In the areas with suitable temperature and high humidity, fleas are more harmful to feed. 3 Rat damage: Rats do harm not only because they eat large amounts of feed, but they also cause feed pollution and cause disease transmission. 2. Microbial contamination in feed. 1 mold. The main fungi that can cause human and animal poisoning are Aspergillus flavus, Penicillium and Fusarium. 2 mycotoxins. The most common mycotoxins are aflatoxins, zeaxanthin, zearalenone and trichothecenes, of which aflatoxin is the most toxic. 3. Anti-nutritional factors in feed. Anti-nutritional factors in feed mainly include: protease inhibitors, carbohydrate inhibitors, inhibitors of biological effectiveness of mineral elements, antagonistic vitamins, and factors that stimulate the immune system of animals. Their presence interferes with the digestion, absorption, and utilization of nutrients in feed. 4. Poisonous and harmful chemicals in feed. The substance is mainly caused by the following three types of pollution. 1 Pesticide contamination. 2 Industrial "three wastes" pollution. 3 Pollution caused by nutritive mineral additives. 5. Pollution from non-nutritive additives in feed. The use of Antibiotics, hormones, antioxidants, mildew-proofing agents, and sedatives can play a significant role in preventing disease, improving feed utilization and growth, but without strict adherence to the principles of use and control of use, safe use, and withdrawal time, Drugs and their metabolites will remain in meat, eggs, and milk, and they will pollute the environment through the excrement of livestock and poultry. 6. Toxicants and cross-contamination from feed processing. Due to improper control of process conditions, additives with complex ingredients in the feed will undergo degradation reactions in the special processing processes such as comminution, transportation, mixing, granulation, and bulking. Oxidation-reduction reactions will generate some complex compounds. This reduces the The potency of the active ingredient in the feed, on the other hand, generates new harmful substances. In addition, mixed contamination in the feed production process is also an important factor affecting the quality of feed hygiene. Therefore, in the feed processing process, especially in the feed plus drug production process, attention must be paid to the cleaning of the equipment to avoid the classification and residue of the drug in the process of transportation and mixing. China Agricultural Network Editor
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