| Core Tip: In the southern part of the summer, the weather is hot and humid. For the southern feed production enterprises, the prevention and control of the damage to the feed of Aspergillus flavus has once again become the focus of the year. It is understood that the optimum growth temperature of Aspergillus flavus is 25 ° C - 30 ° C, and the optimum relative humidity is 80% - 90%. |
Damp heat easy to cause Aspergillus flavus
In the south of the summer, the weather is hot and humid. For the feed production enterprises in the south, the prevention and control of the damage to the feed of Aspergillus flavus has once again become the focus of work in the year. It is understood that the optimum growth temperature of Aspergillus flavus is 25 ° C - 30 ° C, and the optimum relative humidity is 80% - 90%.
When the moisture content of corn, wheat, rice and other cereal feed ingredients is 17%-18%, the optimum Aspergillus flavus grows and multiplies. After the smashing of the cereals, if the moisture content is too high, it is more suitable for the growth of Aspergillus flavus. Therefore, the water content of the feed ingredients should be controlled below the mildew water content.
In addition, feed is also susceptible to contamination by Aspergillus flavus in warehouses and production pipelines. If the feed ingredients are stored for a long time or the warehouse is wet or leaky, too much inventory is not paid attention to ventilation, drying, cleaning, especially the already crushed materials. Because the particles are small, it is easy to absorb the surrounding water, it is likely to be Aspergillus flavus. Growing and breeding to create the right temperature and humidity. In the production of pellet feed, attention should be paid to the choice of cooling and supporting fan. Otherwise, the cooling time of pellet feed is not enough or the air volume is insufficient. The moisture and temperature of the feed are too high, which leads to the growth of Aspergillus flavus. Regularly clean up the particulate material to enhance the mold deposits formed in the hopper or pipe.
Aflatoxin is resistant to high temperature and is difficult to be destroyed during the processing of compound feed. When contaminated raw materials are used, the mixed feed is contaminated, which may cause poisoning of humans and animals. The difuran ring structure in the aflatoxin molecule is an important structure for the production of toxins. Studies have shown that the toxic effect of aflatoxin is to interfere with the synthesis of cellular proteins, causing systemic damage to animals.
Aflatoxin is a highly toxic substance, and the median lethal dose of aflatoxin B1 is only 0.36 mg/kg body weight, which is 10 times larger than potassium cyanide. Aflatoxin is the strongest carcinogen found at present, and its carcinogenicity is 900 times that of cream yellow. Its ability to induce liver cancer is 75 times greater than that of dimethylnitrosamine.
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