How Far East

I have some clients in PA, OH and they have followed the direction I have learned over the 38 years we have sent mule deer back East. You need to worm with ivermic one time a month because you have brain worms back East and mule deer have no defense to them. Untreated they will die. You need to mow the grass in the pen as much as you can to keep them from being wet. Best if you can put your pen on south facing slopes with no standing water. Give them a shed.
As far as hybrid sheep we are working on color and have made advancements in getting that right. We have Alaskan dall, Stone and bighorn. I have some pictures in classified under my other passion of sheep here.

Most raise hybrid sheep cause they have a good immune system where as pure North American sheep are lacking in a good immune system. But many of us raise pure wild sheep. I myself have pure rocky bighorns, pure Alaskan dall but only hybrid stone sheep. I don't think there is a pure Stone sheep in the US either in zoo's or private hands.
We will be cloning some stones and maybe some Alaskan dall this fall.
You just can't let them have nose to nose contact with domestic sheep or hybrids as they have a immune system that handles pneumonia and carries pasteurella but pure sheep can't handle that.
The picture on the right is of pure rocky Mountain sheep born here last spring.

That will work.

That is quite interesting, Jack. I'll probably never raise any mule deer, but that answers a question I've pondered for a long time. Thanks!