When I started my goat herd, all of my goats were registered, but after a while I realized that it just wasn't worth registering them. It didn't allow me to sell my milk for more money, and I had no trouble selling kids that were not registered. I got a little less for the kids, but it just wasn't worth the trouble of registering them. So, when I bought more livestock, I cared more about the condtion of the animals I was buying, and the consition of the herd that they came from, than whether the animals were registered. However, if you intend to show the animals, they need to be registered.