Only dogs registered in the national stud book have a record of their parentage and genetic traits.

只有在国家畜类良种登记册上登记过的狗才有它们的亲子关系和遗传特质的记录。

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Only dogs registered in the national stud book have a record of their parentage and genetic traits.

只有在国家畜类良种登记册上登记过的狗才有它们的亲子关系和遗传特质的记录。

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