When I checked Holderread's site, it doesn't show any options for sexed ducklings, only sexed adults.
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Holderread only sells duckings as straight-run. You have to buy adults if you want to be able to choose the genders.My guess is that when people order females, they pull out females. When people order straight run, they get pulled from whatever is left, so they're pulling yours randomly, but they're not starting at 50/50.
On the breeds they sell only straight run, they probably just pull