I show ducks in 4-H, and OUR county rules say that you must house all small animal ( that includes ducks) on your own property, and provide all care for the birds. At fair, the owner of the bird must take full care of the bird, cleaning its cage, and ensure that water and feed is available. ( that means coming to the fair grounds 2 times a day, once early in the AM before the fair opens, then later in the afternoon). You can show any standardized breed ( See the APA book of standards).
You can enter the Breeding project, or the market project. In the breeding project, you basically just raise the ducks, and show them, they are judged on apperence, how well the reflect the APA standard and overall health, then you take them home at the end of fair. Most people do the breeding project. There is no obligation ( and it is against 4-H rules) for the bird to be auctioned.
if you enter the market project, You MUST weigh the bird through its life leading to fair, then the bird will be auctioned off.
As far as the ownership of the bird goes, you must own the bird at least 3 (? depends on your county) months before the fair. Our fair is in July, so all of the birds we are showing must be in our ownership by April 31st. You can get the birds at any age.
here are some helpfull links:
your 4-H extension office:
http://oklahoma4h.okstate.edu/
the APA ( all show birds must follow this):
http://www.amerpoultryassn.com/show_care.htm,