rearing orphan lambs

we thought of doing that too!  Apparently they get very tame, follow you about like dogs.  We were put off by a local sheep owner telling us that sheep can suffer from 101 different diseases, the first symptom of most of them is death!  However, he did say we should give it a go but the lamb in question had already found a home so we didn't in the end.
Good luck if you do do it, I would be interested in the results. 

most certainly, pigs are hardy, happy and fun