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I believe that there are barn designs that capture urine.

As far as I've seen that's just normal barn design. Cows relieve themselves (both ways) into a gutter that runs behind their stalls, and then when you clean the gutters it all gets spread onto the field.

Or they stand on grating and it falls down there.

...this had led to a number of accidents, the latest I recall was where the floor collapsed and dozens of cows ended up in the cesspit below. Others involve people falling in and dying from the fumes.

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