 Techniques for using cryopreservation to develop a sperm bank for Poitou donkeys have been in development in France since at least 1997, but Hamilton has pioneered the use of artificial insemination using frozen semen in the breed, in order to use genetic material from France to improve Poitou herds in the US.The North American Baudet de Poitou Society, organized by the American Donkey and Mule Society, is the American registry for the breed, coordinating with French officials for inspections and registrations of American-bred Poitou stock.The Baudet is a large breed; among other European donkeys only the Andalucian donkey reaches a similar size.