The production of aflatoxins in feed grains is primarily caused by which of the following?

The production of aflatoxins in feed grains is primarily caused by molds, specifically by certain species of the Aspergillus fungus. These molds thrive in warm, humid conditions and produce aflatoxins as secondary metabolites, which can contaminate grains such as corn, peanuts, and tree nuts. Aflatoxins are highly toxic and carcinogenic substances that pose significant risks to livestock and humans when ingested.

Molds are a crucial factor in this process because they can colonize grains during growth, harvest, and storage. The presence of moisture and favorable temperatures can enhance the growth of these fungi, leading to aflatoxin production. While pests and other environmental conditions like temperature and humidity can influence the overall health of crops and storage conditions, it is the molds that are directly responsible for generating aflatoxins in the grains. Understanding this relationship is essential for managing and mitigating the risks associated with contaminated feed.