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'''Inbreeding''' is the practice of mating closely related animals. How close? So close, that among human beings the relations would be considered [[incest]]. For breeders, the practice has some advantages and disadvantages.
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'''Inbreeding''' is the practice of mating closely related animals. How close? So close, that among human beings the relations would be considered [[incest]]. For breeders, the practice has some advantages and disadvantages.<ref>Sarah Hartwell wrote, "Deleterious genes become widespread and the breed loses vigor." [http://www.dogbreedinfo.com/inbreeding.htm]</ref>