Ancestor calculations 9 Generations:The pedigree analysis is based on the information in the database and is only accurate to that extent. Incomplete generations (where there are unknown ancestors) are shown in red. The only way to get a more exact COI is to add the missing dogs. If there are too many dogs missing, the COI can show 0.000%.
These calculations are very complex, so the page might take longer to load than other pages.
The Inbreeding Coefficient (IC) or Coefficient of Inbreeding (COI) or Coefficient of Kinship of an individual is defined as the probability that the two genes this individual has in a locus are identical by descent, i.e. they are both inherited from a common ancestor.
The calculation of the inbreeding coefficient is done to a given pedigree depth (number of generations): the greater the depth of the pedigree, the greater the chance of finding new common ancestors, and the higher the inbreeding coefficient.
It only makes sense to compare the inbreeding coefficients of different pedigrees if the number of generations used for the calculation are the same and the pedigrees are complete for the generations!
Ancestor loss, maximum ancestors, actual ancestors
The maximum number of possible ancestors in a pedigree is 2^(number of generations+1)-2. The ancestor loss is calculated by comparing the number of possible ancestors in a pedigree with the actual number of different ancestors.
e.g. a four-generation pedigree contains 30 dogs and if a particular pedigree consists of 30 unique dogs then this pedigree has no ancestor loss at all; but in a pedigree with some inbreeding there might only be 26 unique dogs in these four generations meaning an ancestor loss of 13.3%.
Percentage of Blood
The percentage of blood estimates how much an individual ancestor contributes to the pedigree. Sire and dam each make up 50% of a pedigree; grandsires and granddams 25%; great-grandparents contribute 12.5%, etc.
Every time a nominated ancestor appears in the pedigree, the percentage values are added together and their percentage of blood can be estimated.
Eg A dog that appears in the grandparent generation contributes with 25%, and if it also appears in the great-grandparent generation (12.5%) then it has a percentage of blood of 37.5% (25 + 12.5).
Calculations for: Zenith's Red Sky At Morning
Coefficient of Inbreeding (COI): 19.371%
|Analysis Summary||# of dogs||Gen 1||Gen 2||Gen 3||Gen 4||Gen 5||Gen 6||Gen 7||Gen 8||Gen 9|
|Ancestors in 9 generations||301||2||3||6||12||22||34||57||105||166|
|Max. ancestor count||1022||2||4||8||16||32||64||128||256||512|
|Ancestor loss %||70.5%|