Goosey
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Usually these anti grain arguments end up with the cows get sick on grain, grass is perfect for them crap.
Here is a tip for you. Grass is not the perfect feed for cows, I so wish it was, it would make my job a lot easier. Cows can and do get sick and even die from grazing grass.
Does it have anything to do with the type of grass the cow is eating Baz?