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Might be worth mentioning that half of that will be water content.

Does that matter? I'm not trying to be sarcastic or glib, does it help in any way that it's half water?

It's probably not an accurate comparison, but I don't find any consolation in the fact that a lot of the bulk/weight of cleaning my cat's litter box is water. I don't know if it meaningfully changes anything about the task for a cow though.

its actually 70-90% water. it matters because water is very heavy, and whats left over will be dramatically less after it dries out.

its a large amount of waste, but its not 150lbs of solids

Yeah cow manure is VERY wet.

Compare to horse manure which is relatively dry, easy to shovel.

The context was shoveling a barn, and you can't leave it until it dries out, can you? I don't know how often you have to clean a barn, or how long it takes for the manure to dry, but my naive assumption would be that it takes too long to dry for how often you need to shovel.

You assumption is correct. It is scraped out while still wet.

Tangentially, that can be a job for robots: https://www.youtube.com/watch?v=pz4t0qIISTs

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