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An animal rights group has captured footage of cows fitted with plastic "portholes" at a French research facility which activists have branded "illegal experiments".
Animal rights group L214 published the video yesterday showing the cows with transparent plastic devices on their side.
The plastic porthole devices, known as cannulas, have been used for decades and is a relatively a common practise in industrial farming.
The animals are known as cannulated or fistulated cows, and the device allows scientists to optimise and regulate their nutrition by observing the inside of their four stomachs.