Goats come in two varieties dairy and meat. Nubians are dairy type. Boers are meat type. Some boers have a tough time with producing milk, even enough for their young. So this is why some farmers do a boer cross. Crosses with nubian and toggenburgs are fairly common with boers. If you have interest in milking you will need to gain their trust first. The more time you spend the better, and feeding them is a good way of forming trust. Petting and brushing is other good ways. They also have to be producing milk to start with and you can maybe see that if their are nursing a baby. Since they weren't previously milked, you have to find out if they will let you touch their utter. This is why you have to build a trust. Get yourself a book to read up on goats at your local bookstore. There is a lot info out there on goat husbandry, you need to learn so you can keep those goat nice and healthy.