Alllll for it
I don't think urine is much of a difference at all. I've never read or heard you only want to use solids.
If you are worried about urine, compost it. All of my rabbit clean out goes into the garden. Now my garden is big and wide, so all the clean out is side dressing for my plants.
I am a freak when it comes to soil, I want it as natural as possible.
sort of like the soil in the Garden of Eden, so earth worms and rabbits are my go to source for that kind of soil.
there are lots of things I have had to UN learn, but I am only 75, so plenty of time to do it right, lord willing.
right now we are very dry, and so composting my plants very heavy to conserve moisture, with a corn stalk base from the feed lot Piling it up 6 to 8 inches around tomatoes, peppers, squash.