They're pygmy/nubian crosses. Any goat is dual purpose, there are just ranges in the continuum. A sleek Alpine or its cousin Togg breed doesn't have much meat, but will milk and milk. A boer kid, on the other hand, will put on 50 lbs in 4-6 weeks. And it's also about genetics. Some boers will give 8-10 lbs milk/day, albeit boer lactations are usually shorter. Lamancha lactations tend to be longer, but again, genetics determines this. If you're selling an animal for meat get a boer or Kiko or cross. If you're using the meat for yourself or want a dual purpose, pick something on the continuum to favor one or the other or be in the middle depending on what you want.
IMHO, unless you get really fantastic quality kinders, you're better off going with newer-line mini-nubians (nubian/nigerian crosses), or even regular Nigerians. Nigerians are the milk variety of pygmy goats. They were all called west african dwarf goats, and then split up on the basis of their appearance and milkability, with pygmys considered more meat and Nigerians more milk. But they're basically the same goat, just different genetic lines. Newer mini-goat lines are better than many kinder lines I've seen. The kinders I've seen (not all) don't give much milk, or have poor conversion, or small teat size, or conformation issues, or other challenges.
Check the MDGA for a breeder list.
