I, too, have Nigis. The first thing I tell anyone that wants to milk a Nigi -- spend the money and get does from established, good quality milk lines. Go to the farm (if at all possible) and milk their dam. That will give you a fair idea on what to expect. Some people cannot get their hands/fingers around Nigi teats and just can't milk them. Their teats are so tiny anyway that if they weren't bred for teat size, udder attachment and production... you will likely become so frustrated at trying to milk them that you will just give up. You might 'luck-out' and get an easy milker without the genetics but don't expect that.
I would also say that Nigi's tend to have few birthing problems. I don't have years of personal experience but my girls have had zero problems with kidding and are great mommas. I keep in touch with a couple of Nigi breeders around here and they rarely have had issues with birthing. But, any goat can.
I don't breed my Nigis until they are 18 months old. I personally like to give them plenty of time to grow up/mature themselves (bodywise) before stressing those bodies with babies. I also plan my Nigi births for late spring for warmer weather to make it easier for the kids and in case babies are born at night and I'm not there. My barn isn't heated but my does are always in enclosed kidding stalls starting two weeks before their first due date.
I love my Nigi girls. They are not loud ever until they see a person. They then get quite vocal until someone goes over to pet them or let them out to run around the farm.
I have no experience with mini Nubians so I can't help at all with them.
It's worth finding out from the breeders.
