Mash is just a form that feed comes in. When the ingredients are mixed and ground it is mash. The feed mill then extrudes it through a pelettizer to form pellets. To make crumble the pellets are partly broken down. If the article you read was talking about farmers who make their own feed, then that is usually cheaper and fresher then buying commercial feed. Even buying it in mash form straight from the mill is cheaper, fresher then from a farm store. As for it being close to pasturing them I don't see how, the ingredients in the feed aren't as fresh as what they can find out on the range.