The phrase "official registry" refers to a record or database that is recognized and maintained by a trusted authority. It is a place where important information is collected and stored to ensure accuracy and reliability. Full definition
Although the Merle color pattern is considered to be a marked pattern by official registries this rare color pattern is still sought out by many people who are looking to adopt a Great Dane. (pethelpful.com)
The Animal Pedigree Act provides that only one official registry per breed may exist in Canada, and other breeds not recognized by CKC are registered by other registries such as the Canine Federation of Canada and the Working Canine Association of Canada. (en.wikipedia.org)
He says they are now discussing the possibility of an institution taking over management of the commission's ZooBank, the official registry of its zoological names. (sciencemag.org)