Unless it is a climate controlled building, they tend to accumulate moisture in the building, and have poor airflow.
Sunlight, and airflow are great ways to mitigate mold, as mold grows very poorly under UV light, and airflow in addition to UV radiation dries the fodder out.
If properly dried “hay” is fine to store in a barn or similar structure, but those structures that money to maintain as far as insurance, building, maintenance.
Fodder is commonly left out and in most places where it is used degrades less than the cost of storage when baled. That said, it seem like that wrapping them in plastic or tarping them is a good happy medium.
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