What are disposal materials in animal feeds?

Disposal materials in animal feeds are substances that are not intended to be consumed by the animals but are added to the feed for various purposes such as bulking up the feed, improving texture, or reducing costs. Some common disposal materials in animal feeds include sawdust, straw, hulls, and other fibrous materials. These materials are typically low in nutritional value and may not provide any benefit to the animals, but are used as fillers or to meet certain regulatory requirements.