Do you know what the term Organic means in the food industry? It means no un-natural chemicals or additives. When the "organic" craze was first started, it was due to the unpopularity of pesticides.
Organic does not refer to to what a cow "naturally" eats. I would suppose in the wild, a cow if hungry enough would probably eat the bark off of trees or leaves on a small bush... your point really has little logic at all.