Actually, rabbit manure has a lower amount of nitrogen, which is why it's better to use on your plants, because it doesn't burn them.
That's what I've read anyway
I put my manure in a bin, mix it some water, dirt and put worms in there. It takes a while to break down (actually the stuff I have right now is really nasty cause it's been there for a year! and we haven't done anything with it...it's just a small tub though.) and then you can mix it in with the dirt of your plants.
During this past summer, I took some and mixed it with the dirt of a rose bush, and the roses turned out really nice.
Of course, you don't want to overload plants/bushes, etc. so you just add a correct amount in with the dirt.