They cannot possibly be plucked by hand like in the old farm days, so these must be a system.
It is ridiculous that there are so many ducks and chickens and geese and turkeys sold at all the supermarkets in the world.
here is a generalization of how it is done: http://www.fao.org/docrep/003/t0561e/T0561E03.htm
you can google: machine to pluck feathers
Carcasses are momentarily dippedin scading water, then a machine with multiple brushes of rubber fingers pull out the feathers.
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my mom usually has to do it beca watever system they got doesnt do a very good job of it.
References :
here is a generalization of how it is done: http://www.fao.org/docrep/003/t0561e/T0561E03.htm
you can google: machine to pluck feathers
References :