Definitions of Terms
COI = Coefficient of Inbreeding
The standard (mathematical) measure for the level of inbreeding is the Inbreeding Co-efficient. It indicates the probability (between 0% and 100%) that genes at a randomly chosen location in the DNA are identical by descent. The technique assumes that there are 2 forms of a gene and that each form has an equal chance to be passed on to the next generation.
One limitation on calculating inbreeding coefficients is the depth of pedigrees available. Animals with a shallow pedigree may have a low inbreeding coefficient simply because their related ancestors are not on the database.
Inbreeding Depression
Inbreeding depression is a term used to describe the reduction in performance and viability due to the increase in inbreeding levels (reduced genetic variation). Reproductive fitness tends to be affected more than performance traits in this respect. The extent of inbreeding depression depends on the population being measured, the level of genes already fixed in the population, the frequency of any deleterious genes that may exist in the population and chance effects of which particular genes are affected.
There is no defined limit as to what is an acceptable level of inbreeding in domestic animal populations. However, inbreeding depression is likely to be more apparent once inbreeding levels get to above 10%. As a very rough guide, there is often a 2-20% decrease in performance of the trait per 10% of inbreeding coefficient.
COR - Coefficient of Relationship
The Coefficient of Relationship (COR) is a measure of the level of consanguinity between two given dogs in a pedigree.
The coefficient of relationships is the significance of an ancestor(s) who may be making major genetic contributions to the dog in question. Particularly, if they appear in multitudes as is common in some pedigrees that include popular sires. The COR will rise or fall according to how many times the ancestor saturates the earlier generations.
AKC or AVK = Ancestor Loss Coefficient
Ancestor-Loss is given when the same ancestor appear more than once in the pedigree of the dog. A 5-generations-pedigree shows 62 possible ancestors. If one of this 62 possible ancestors appears twice, the dog in question has indeed only 61 different ancestors. If 3 ancestors appear twice, this dog has indeed only 59 different ancestors. The AVK is calculated out of the no. of the ancestors and the total no. of possible ancestors.
The AVK, as well as COR and COI, depends on the number. of generations it is calculated over. There is normally a loss from generation to generation as most dogs go back to the same roots/ancestors.
HS = Hip Score
Hip Score is obtained from the OFA database. If you see HS: NA, this simply means the dog is not tested for Hip Dysplasia or we have not yet recorded the results. The NA simply means not available.
The standard (mathematical) measure for the level of inbreeding is the Inbreeding Co-efficient. It indicates the probability (between 0% and 100%) that genes at a randomly chosen location in the DNA are identical by descent. The technique assumes that there are 2 forms of a gene and that each form has an equal chance to be passed on to the next generation.
One limitation on calculating inbreeding coefficients is the depth of pedigrees available. Animals with a shallow pedigree may have a low inbreeding coefficient simply because their related ancestors are not on the database.
Inbreeding Depression
Inbreeding depression is a term used to describe the reduction in performance and viability due to the increase in inbreeding levels (reduced genetic variation). Reproductive fitness tends to be affected more than performance traits in this respect. The extent of inbreeding depression depends on the population being measured, the level of genes already fixed in the population, the frequency of any deleterious genes that may exist in the population and chance effects of which particular genes are affected.
There is no defined limit as to what is an acceptable level of inbreeding in domestic animal populations. However, inbreeding depression is likely to be more apparent once inbreeding levels get to above 10%. As a very rough guide, there is often a 2-20% decrease in performance of the trait per 10% of inbreeding coefficient.
COR - Coefficient of Relationship
The Coefficient of Relationship (COR) is a measure of the level of consanguinity between two given dogs in a pedigree.
The coefficient of relationships is the significance of an ancestor(s) who may be making major genetic contributions to the dog in question. Particularly, if they appear in multitudes as is common in some pedigrees that include popular sires. The COR will rise or fall according to how many times the ancestor saturates the earlier generations.
AKC or AVK = Ancestor Loss Coefficient
Ancestor-Loss is given when the same ancestor appear more than once in the pedigree of the dog. A 5-generations-pedigree shows 62 possible ancestors. If one of this 62 possible ancestors appears twice, the dog in question has indeed only 61 different ancestors. If 3 ancestors appear twice, this dog has indeed only 59 different ancestors. The AVK is calculated out of the no. of the ancestors and the total no. of possible ancestors.
The AVK, as well as COR and COI, depends on the number. of generations it is calculated over. There is normally a loss from generation to generation as most dogs go back to the same roots/ancestors.
HS = Hip Score
Hip Score is obtained from the OFA database. If you see HS: NA, this simply means the dog is not tested for Hip Dysplasia or we have not yet recorded the results. The NA simply means not available.