Urine is primarily urea and water. note that i have used urea in the past to bump up CS protein and that i found in doing so my soluble to insoluble ratios were the same as untreated CS Our barns had a slope. If i were to build a barn today I'd build a barn with 2 slopes, one with the barn itself with a slight slope, another in the alleyways sloping to gutters of 1-1.5 inches deep that can be swept with a mechanical/industrial broom when the alleys are cleaned and narrow enough that a cow can't walk the gutter. Placing the gutters between the front and rear legs of cows at the feed bunk and down the middle of stall alleys would further minimum fecal material interfering with the flow of urine down a gutter. I'd scrape and sweep my gutters immediately after moving cows out of an alley way. (Note that I would move cows in 2 stages, minimizing the time in the holding area, crowding cows out of stall areas, enabling them to step up to the feed bunk or enter an open gated holding area, reducing by half the time spent in the holding area would further help capture urine vs having to haul it to a field.)
You might even be able to reduce the amount of urine in the barns manure to the point where the amount of urease is reduced, lowering ammonium losses.
It isn't unusual for holding areas to have separate manure handling systems. It isn't inconceivable that if the amount of urease in the barns manure could be reduced lowering ammonium losses that holding area manure be handled separately from holding area manure.
FYI: The brits are working on taking manure, processing atmospheric Nitrogen and increasing manures nitrogen content by 20%. ON FARM N PRODUCTION that might reduce the purchase of commercial N to zero.
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