In order to be incorporated into the studbook, stallions and mares must pass rigorous testing. The WHF establishes international breeding guidelines, objectives and rules for studbook selection, and performance tests. For breeding, Sudan's studbook number was 0372. It is also responsible for inspecting breeding stock before they are registered with the studbook. The quality of the Akhal-Teke horses are determined by the studbook manager. Since 2018 Wroclaw zoo is the new studbook keeper . Dublin Zoo holds the European studbook for Moluccan cockatoos. The French studbook for the breed is split into two sections. China's captive South China tigers have been entered onto a centrally registered studbook. However, type is not part of the studbook evaluation standard for trotters. The international red panda studbook is currently managed at Rotterdam Zoo in the Netherlands. The zoo manages the international studbook for this species. An international studbook is maintained to help manage animals held in captivity. Since the beginning of the studbook, there have been over 13,600 horses registered. In 1926, the first studbook was established in North Tyrol.