You have to register, but it's free. And gives much more information than is available for free from the Australian TB studbook. There are some weird New Zealand quirks, however. They have something called NSB horses, which I haven't quite figured out yet. The horses are full TBs, but if they haven't been used for registered TB breeding, they seem to be moved to NSB (Non Stud Book) I'm not quite sure if this is the equivalent of the Weatherby's Non Thoroughbred registry. The people there, though, are really helpful when you send them a query.
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