The AES recognises all WBFSH Member Studbooks. For a full list of these studbooks, go to http://www.wbfsh.org/files/Member_list_as_per_April_5th_2019.pdf.

In addition to this list, the AES also recognises horses and ponies from other studbooks that are suitable as an outcross into the studbook for performance breeding for one of the following disciplines: Showjumping, Dressage and Eventing. This includes horses and ponies from the following UK studbooks:

The Arab Horse Society, BAPSH, British Connemara Pony Society, British Palomino Society, Cleveland Bay Horse Society, Coloured Horse and Pony Society, Friesian Horse Association of Great Britain and Ireland, Hackney Horse Society, Haflinger Society of Great Britain, Highland Pony Society, Lipizzaner National Studbook Association of Great Britain, Lipizzaner Society of Great Britain, Lusitano Breed Society of Great Britain, National Pony Society, The Scottish Sports Horse, The Sports Pony Studbook Society, Weatherbys, Welsh Pony & Cob Society.