'Heavy Ducks' are those which generally weigh over 7lbs in the female and 8lbs in the drake. The largest of the heavy breeds are the traditional English Aylesbury and the Rouen. Drakes can weigh up to 12 lbs and ducks 9-11 lbs.
In general, 'heavies' are the old-established breeds, which were developed for the table. The Cayuga was the table bird of the USA before the Chinese Pekin was imported in 1874. The Pekin revolutionised the table duck industry both in the USA and in the UK where it began to replace the pink-billed commercial Aylesbury.
