Lack of genetic diversity threatens dog breed

DNA study shows English bulldog gene pool may be too small to heal breed and could serve as case study for livestock breeders.

Genetic diversity within an animal breed — whether livestock or a companion animal — is an important characteristic, especially as breeders focus on a narrow set of traits and increasingly utilize a decreasing number of "superior" animals through artificial insemination.

A case in point could be the popular but characteristically unhealthy English bulldog, which may have been bred into a corner, as it now lacks the diversity in its gene pool to make much-needed health improvements,

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