Health Report Final - Flipbook - Page 52
Coefficient Of Inbreeding (COI) cont...
The results above are for both show and working lines as well as dogs of foreign origin
pedigrees indica ng this is a breed wide problem not a problem of any par cular sec on
of the breed.
The Kennel Club inbreeding coefficient for each breed is revised annually and currently
stands at 15.9% for the Clumber spaniel.
The main reason for this is that the Kennel Club’s data relies on full pedigrees to be
accurate addi onally the KC uses simplis c maths to es mate the extent to which genes
are repeated as a result of inbreeding.
Unfortunately for the majority of dogs registered on the Kennel Club the pedigrees are
incomplete or where a dog is imported it is given an ar ficially low COI due to foreign
pedigrees not being included in the data used for the calcula on. The Kennel Club COI also
requires that the dog be correctly registered.
Gene c COI looks at overlapping genes not paper pedigrees so is much more accurate and
does not rely on people correctly registering the dogs.
The average Kennel Club COI for dogs tested was 18.3, while the gene c COI was 39.8. To
give an idea of level of inbreeding this represents a father daughter ma ng would produce
a puppy with a COI of around 25%.
The lowest ever gene c COI of a Clumber tested by Embark was 28, while the highest was
57, (This data includes all Clumber spaniels tested by embark, U.K, USA and European,
show and working, not just the ones in the WCSS project). There was no difference
between the sexes.
During the Embark project the lowest COI so far was 30 while the highest was 57. The
highest a gene c COI can be is 60.
MEDIAN
46
KENNEL CLUB COI
GENETIC COI OF WCSS DATA
GENETIC COI OF EMBARKS DA‐
TA
20.5%
40%
45%
