Actually Volsung, you are wrong. If a cow consumes all the grass in the immediate area surrounding it, it will move on. I know several farmers who have many hundreds of milk and meat cows. They don't need prompting around the field to avoid starving, they just wonder about themselves.
Occasionally they will be moved to another field, but that is only because the farmer needs to do work on the field they were in. Cows are not really that "dumb", or at least, they aren't as dumb as people make them out to be. If a cow sees a human approach a gate, then the cow will slowly and carefully approach, purely out of curiousity. If the animal was dumb, then it wouldn't react to the humans presence at all.
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