What is a required feature for storage facilities to prevent issues with feed?

Having a storage facility that is vermin proof and clean is crucial for preserving the quality and safety of feed. Pests such as rodents and insects can contaminate feed supplies, leading to spoilage and potential harm to animals that consume contaminated feed. By ensuring that storage areas are designed to prevent vermin intrusion and are kept clean, facilities can significantly reduce the risk of these issues occurring. This not only protects the feed but also maintains the health and well-being of the animals relying on it for nutrition.

The other options, while potentially beneficial in certain contexts, do not address the most immediate risks associated with feed storage. For instance, heating systems may be unnecessary in many climates and could even contribute to spoilage in some cases. Overhead lighting might improve visibility during storage management but does not directly affect feed quality or safety. Insulation can help with temperature control in some situations, but it is not a primary concern compared to ensuring the storage environment is free from pests and contaminants.