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but here at the this experimental farm run by scotland s 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: it s all about the stomach well, stomachs. cows have four of them. we are putting in elsewhere. reporter: rainer roehe has been studying the digestive process in cows, and he s found that the microbes in their stomach not only vary from cow to could you be but they determine how much methane the cow produces. a brief lesson on bovine biology is useful here. cows don t actually digest what they eat. the bugs in their gut do. their food mixes with a kind of microbe soup in the rumen or first stomach and is then rechewed before passing through the rest of the system.

Holy cowScotlands rural collegeExperimental farm runStomach contentBrief lessonRainer roeheBovine biologyMicrobe soupFood mixes