I am raising meat goats. I started out heavy percentage of Boers, but, I found the more crossed they were, the faster they grew, the better mothers they were, and the hardier they were. So, I run a mixture of Boers, Spanish, Kinko, and a few with some "fainting" goat crossed.
Some people make a pretty good living providing goats to clean out the brush to landowners and local governments.
I have some cross bred hair sheep as well. The lambs grow much faster than kids, or wool sheep. They are a mixture of Dorper, Barbado, and St. Croix. I suspect a few have some Rambouillet in them as well