The cows with holes in their sides – Channel 4 News

A Swiss company has released footage of14 cannulated cows - cows that have a hole in their sides that allow farmers to look into their stomach and ensure more balanced feeding for the animals.
A Swiss company has released footage of14 cannulated cows - cows that have a hole in their sides that allow farmers to look into their stomach and ensure more balanced feeding for the animals.

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Why do some Cows have HOLES drilled into their sides?

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