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A DNA test for Congenital Stationary Night Blindness (CSNB)
What is CSNB?
A DNA test for CSNB
Breeds at risk
As far as we know until now, CSNB only affects Briards. We should be aware
that the disorder can be found in related crossbred animals as well.
In the past, when breeds were developed, often breeding stock of other breeds was used to
improve certain characteristics. In the process of introducing the desired qualities
(genes) into a breed, it cannot be avoided that many neutral as well as undesirable genes
cross the barrier between breeds. For the time being, in cases night blindness is found in a
breed with "family ties" with the Briard, checking with the CSNB DNA test could be a
"best guess". If it can be proven that the defective allele is present, applying that DNA
test will help the breeders in their selection against the disorder. From there on it is one
out of two, solving an existing breed problem or preventing a future breed problem from
developing.
Breeding policy
Testing for CSNB
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