I just go some that I'm composting. This is direct from the sheep pen. Jorge Cervantes, book has a big section on all kinds of organic amendments and there it lists it has having really low N-P-K, kinda like worm castings. The book also says that, because the poop is more naturally aerated when it comes out of the sheep's butt, it's good for activating a compost pile. Sounds like it would bubble well.
I just got it, haven't done much growing with it. I threw it in my compost, added some to some super soil that's aging for months, added it to a horse manure pile where it's 50/50 with the horse manure. I topped dressed a little on a three week old plant-I'll give a yell if anything bad happens. From Cervantes's description, it sounds kinda underrated.