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But here at the this experimental farm run by scotlands rural college, they think they found a way to change that, because it turns out one cow is not like another. it surprised you when you look add one cow and you thought holy-- holy cow, this stomach content is a lot different than in this cow than it is in that cow. >> there is a huge variation in the stomach. >> reporter: its all about the stomach-- well, stomachs. cows have four of them. >> we are putting in elsewhere. >> reporter: rainer ...