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Pairing and COI

Plan the next generation with your studbook.

Your registrar checks a pairing before the animals are bred. Pedigrees fill in from your registry, and the COI lands in bands your club sets.

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Pedigrees

Sire and dam, pedigrees filled in.

Your registrar searches by name or registration number. Breed Ledger shows both pedigrees from your studbook, five or six generations deep, calculates the COI from up to eleven, and says when ancestors are missing.

  • Registry staff only, never on the public site
  • Only animals registered with your club
  • Pedigree completeness shown with every result

Pairing analysis · registry staff

Example data
5.5%COI for the offspring, up to eleven generations

5.5 percent, in the Moderate band. Bands are set by the club.

COI and bands

A number with a frame around it.

The COI lands in bands your club sets. The repeated ancestors are listed with how many places each fills in the pedigree, so the registrar can see where the number comes from.

  • Bands and labels set by your club
  • COI and AVK on every result
  • Repeated ancestors, with how often each appears

Saved pairings

Results your registrar can keep.

A pairing can be saved with its outcome, exported as a PDF with your club's logo, or shared with the breeder by a link that can be extended or revoked.

  • Saved pairing history
  • PDF export with your logo
  • Share links you can revoke

Outcross program

Work out an outcross program.

The table shows the expected share of original-line ancestry, generation by generation. When an animal counts as original line is your club's rule.

Outcross program lines
LineExpected share of original lineHow it is made
Original line100%The club's established studbook.
Foundation outcross0%Brought in from outside the studbook.
F150%Foundation outcross × original line.
F275%F1 × original line.
F387.5%F2 × original line.

The free outcross calculator shows the share of original-line ancestry generation by generation. Try the outcross calculator

A note on COI

Pedigree COI is calculated from the recorded pedigree. Genomic COI comes from a DNA test, and labs measure it in different ways. The two measure different things, so they are shown separately and never compared as if they were the same number.

Questions

Pairing questions.

Can the public see COI?
No. Pairing analysis is for your registry staff. A breeder sees a result only when the registrar shares its link.
Which species are supported?
Species set up for pedigree analysis. For any other species, the screen says analysis is not available rather than showing a number.
What if our pedigrees are incomplete?
Every result shows how complete the pedigree is. When too little ancestry is recorded, Breed Ledger shows no COI rather than a guess.

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Run a pairing from your own studbook.

Bring two animals. I will check them on the call.

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