Inbreeding - Breeders Assistant

Breeders Assistant can compute the inbreeding coefficient and associated information such as loss of heterozygosity and the relationship coefficient. It can also produce a number of reports of related information, such as common ancestor listings. Much of this information can be easily included in forms such as pedigrees.

If you are unsure as to what exactly is meant by the terms 'inbreeding' or 'common ancestors', please refer to our overview of inbreeding and common ancestors.

Inbreeding options within Breeders Assistant include:

Configurable number of generations of ancestors to include in the calculation (max 60).

Whether to include the inbreeding coefficient on pedigrees and trial mating pedigrees (and also for each ancestor if you want).

Whether to include the relationship coefficient on trial mating pedigrees and mating certificates1.

Generation of related information including:

  • The depth at which the furthest ancestor was found
  • How many generations of ancestors were full
  • Total number of ancestors found
  • Total number of unique ancestors
  • Total number of ancestors common to both sides of the pedigree

Inbreeding Table
Inbreeding Table

You can tabulate all the inbreeding calculation details given above directly in the main window, for all animals in your database. Just select Inbreeding Table from the View list (above the animal table). Breeders Assistant can rapidly calculate the inbreeding coefficients for your entire database.

Pedigree With Common Ancestor Highlights
Pedigree With Common Ancestor Highlights
[Hi Res]

Highlight common ancestors within printable pedigrees.

Compute the Rate of Inbreeding - the proportion of heterozygosity remaining per generation. E.g. consider an individual that has a coefficient of inbreeding of 12.5% when calculated to 8 generations. The amount of heterozygosity remaining is 100-12.5 = 87.5% after 8 generations. This is equivalent to a rate of inbreeding of 98.34471% per generation (because 0.9834471 multiplied 8 times equals 0.875).

A related value is the Loss of Heterozygosity. This is simply 100 minus the rate of inbreeding. It is a measure of how much heterozygosity is lost, per generation.

Pedigree With Ancestor Inbreeding Highlights [requires Pro/Commercial Edition]
Pedigree With Ancestor Inbreeding Highlights [requires Pro/Commercial Edition]
[Hi Res]

Emphasize highly inbred ancestors within printable pedigrees using colour-coded shading. [requires the Professional Edition (or better)]

Inbreeding Analysis
Inbreeding Analysis

Produce an inbreeding analysis report for an animal, trial mating or mating - giving all the above details calculated with a range of ancestor depths. This can show you how the inbreeding increases as you descend the pedigree.

Detect circularities (self-parenting errors) in the ancestors. A circularity is when an individual appears within its own ancestors. Whilst that is impossible in nature, it is possible if you have an error in your pedigree data. E.g.:

    Circularity detected in ancestors at G14-18:
    Arripay Bigfoot
    -> Mylady Kazoo
    -> Ch. Arripay Handsome JW
    -> Am. & UK Ch. Arripay Sunshine JW
    -> Arripay Bigfoot

This report is saying that Arripay Bigfoot is descended from itself - and the report shows you the other ancestors that make up the 'loop' in your data. It gives you the information you need to fix these errors.

Produce a report listing the common ancestors of any animal.

Analyse ancestors to see the contribution to the COI resulting from any single common ancestor.

Tag the common ancestors of an animal to a chosen number of generations.


1. Mating certificates are only available with the Cat and Dog versions of Breeders Assistant.


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