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Aflatoxins are harmful chemicals produced by two species of fungi: Aspergillus parasiticus and Aspergillus flavus. Aflatoxins are highly carcinogenic and toxic, causing diseases in animals and humans when they consume contaminated feeds. There are various types of Aflatoxins, which are classified in groups of B, G, and M. The B Aflatoxins emit a blue color while the G Aflatoxins have a green light under the UV light. Aflatoxins B1 is produced by both Aspergillus parasiticus and Aspergillus flavus molds, and is the most carcinogenic and toxic. The M aflatoxins are metabolites of the B1 aflatoxins, and are detected in milk and urine of animals fed on contaminated feeds.
The Aspergillus mold is ubiquitous, occurring everywhere, especially during winter and autumn. It is also found at home in damp places especially in bedding. The mold mainly grows on plants and plant produce such as corn, nuts, rice, crude vegetable oil and other dried foods. It also grows on decayed vegetation, hay and soil. High temperatures of about 80° F and moisture of about 85% humidity are favorable conditions for the growth of the mold. The mold attacks field crops when there is delayed drying or damp storage. The presence of rodents and insects in the harvested crop also facilitates the growth of the mold. Processed foods such as milk, yoghurt, and cheese may also contain aflatoxins if the animal fed on contaminated feeds.
The Aspergillus mold belongs to the phylum Ascomycota, which is also known as sac fungi. The members of this phylum reproduce both sexually through ascospores and asexually through conidia. The ascus is the identifying characteristic of this phylum, where meiosis and nuclear fission take place. Members of Ascomycota are the most dangerous of all fungi,.............
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