Where am I meant to make the logical leap to "this is a bad thing"? Keeping a cow healthy prior to it being slaughtered seems like a good thing, as far as I can tell, and I don't know of any great evils coming from corn feed, other than the increased land and water cost. The use of antibiotics is something I have my own concerns on, but I fail to see what it has to do with GMO rice and feeding cows corn.