Oh my God! Are there holes in those cows? Yes there are.
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In order to perform experiments on cows, scientists have developed a way to surgically make permanent holes in their stomachs in order to study their digestive systems. The holes are called fistulas, which make the cows fistulated. One can feed the cow, and then later catch the food while it’s digesting to see how it’s doing.
straight stolen from Blame It On The Voices