This is indeed a very interesting question. Come to think that will goose feather reproduce if only part of it is trimmed/ removed? I guess they will not. Also, also since they are so many goose being slaughtered daily and why not salvage the feather for shuttlecocks?
Geese and ducks molt their feathers every year, naturally, all by themselves, so you could follow your pet geese or ducks around and collect the left wing feathers as they dropped out and use them to make your own shuttlecocks if you wanted to make some that involved not killing the birds.
The feathers ARE harvested from slaughtered ducks and geese and used for many uses, shuttlecocks included, the geese are not killed to get the feathers, the feathers are removed to get to the meat. The shuttlecock manufacturers do get the left wing feathers from the meat processing factories.
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