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esistono molte e diverse razze domestiche tra loro perfettamente interfeconde , anche con i derivati domestici dell’oca cignoide domestica ( anser cygnoides ), specie asiatica con la quale esiste interfecondità.
there are many and various domestic races perfectly inter-fecund, also with the domestic derivates of the swan goose ( anser cygnoides ), asian species with which inter-fecundity do exist.