The last paragraph on this is interesting and could lead to animals being fed the wrong feed.It cant be copied and pasted.
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the corn fed cattle vs. grass fed is pretty obvious.If they are corn fed even after the first six months the amount of antibiotics they are fed leaves all kinds of problem doors open for the cows.
But from what i have read I agree with you for a herd to die like they did it almost had to be on purpose with intentional poisoning.I don't see any other way it could have happened.
https://www.pbs.org/wgbh/pages/frontline/shows/meat/interviews/pollan.html
Pollan a NYT former writer did a pretty exhaustive study on cows but not so much on the potential for them to be poisoned. He did suggest however that corn fed cows can easily become a disaster if not monitored almost constantly.
I would agree.