Plain City, Ohio (AP) -- The cows milk themselves on the Gruenbaum Family Farm in Plain City, outside Columbus.
It's the first farm in Ohio with robotic milking machines that lure cows with food and then milk them with an arm and tubes that automatically attach to the udder.
The cows are monitored with sensors that record their weight, milk output and milk quality and how often each animal goes in to be milked.
The machines are produced by the Lely group in the Netherlands.
The company's regional salesman says about 200 of the units will be installed in the U.S. by the end of the year.
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