The Crested White ducks are probably of Pekin and Aylesbury breeding, the tuft of feathers on the head, which occasionally appears, having been recognized as a point of attraction, selected and bred for. The breed has not been extensively bred. The best specimens usually run about 1 lb lighter in weight than the best Pekin. In type they follow the Pekin.
Reference:
All Breeds of Poultry, Origin: History: Description, Mating
and Characteristics, by Frank L. Platt. Published by AMERICAN POULTRY JOURNAL,
Chicago, Illinois.