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No. But, if he is black but one of his parents was not, then he would be heterozygous. Then, any brown ducklings born to a non brown mother would be girls. Non brown ducklings could be either.

Do you know the genders of your two current ducks? I ask, because there are sex-linked ducklings. You need a drake which is sex-linked brown. In Runners, he could be chocolate, a fawn and white, or brown dusky or wild type. The female needs to not have brown. She could be blue, black, wild...