Stallion Match Explained
Stallion Match answers a single question: if you put this mare to this stallion, how closely would the resulting pedigree resemble the pedigrees of horses that have actually reached stakes level?
It works on any male horse, not only commercial stallions, so unproven sires, first-season sires and horses standing privately can be assessed on the same terms as an established stallion.
Three ways in
Click Stallion Match in the top menu and choose a tab.
Stallions
A directory of the stallions promoted on G1 Goldmine and Stallion Match by their stud farms. Filter by Location, Farm, Year to Stud, Colour, Fee Range (with a currency selector and an option to include private fees), Sire, Dam Sire and Key Ancestor, then click Search.
Roster Mating
Test your mare against a farm's roster in one search. Enter your mare, select a promoted farm and click Search. Every stallion is listed with his pedigree, fee and rating: 20/20 Match, Perfect Match or Normal Match. Click the magnifying glass on any row to open the full match for that stallion. See Roster Mating Explained.
Any Stallion
A single match between any sire and mare in the database, including non-commercial and emerging sires. Click Select Sire and Select Broodmare, pick from your favourites or search by name, then click Confirm Selection.
How the matching works
The platform builds the pedigree your foal would have, then searches for stakes winners whose pedigrees share a pattern with it.
A match does not require an ancestor to sit in the same position in both pedigrees. What matters is that the shared ancestor appears on the same side. An ancestor in the sire half of your mating matching an ancestor in the sire half of a stakes winner counts, even if one sits a generation further back than the other. An ancestor matching across different halves does not count, because that describes a different genetic relationship.
Reading the results
The hypothetical foal's pedigree sits on the left, with duplicated ancestors highlighted. Click View Interactive Pedigree to explore it full screen, or Legend for the abbreviations. See Using the Interactive Pedigree Chart.
The banner at the top shows the rating. A 20/20 Match is a pattern that appears 2.3 times more often in stakes winners' pedigrees. The banner also has a button to contact the stallion's farm about this mating. See Understanding the Ratings and Contacting a Stud Farm.
Stakes Winners Comparison
The table on the right lists the stakes winners sharing a pattern with your mating, with each horse's sex and its Group or Grade 1, 2 and 3 and Listed (L) wins. Two scores show how closely each one matches:
- E, the Exact Score: ancestors in the same position in both pedigrees.
- CSI, the Similarity Score: ancestors on the same side of both pedigrees, in any position.
See Understanding the Exact Score (E) and Similar Score (CSI).
Side By-Side Comparison
Click a horse, or the arrow at the end of its row, to open your hypothetical mating next to that stakes winner. The shared ancestors are highlighted on both pedigrees:
- Dark green: an exact match, the same ancestor in the same position.
- Light green: the same ancestor on the same side, in a different position.
The stakes winner's race wins are listed underneath. This is the part worth spending time on. A score tells you a resemblance exists. The comparison shows what the resemblance consists of, and whether it runs through the parts of the pedigree you care about.
The other panels
- Aptitude Profile: the ages and distances at which the matched stakes winners won. See Aptitude Profile Explained.
- AI Name Assistant: name suggestions drawn from the pedigree. Choose a theme from the dropdown.
- Dosage Summary: the speed to stamina balance of the proposed pedigree. See Dosage Explained.
- Sibling Sales Snapshot: sales results from the mare's close family. See Sibling Sales Snapshot Explained.
Click PDF to download the results, or New Search to start again.
What each plan includes
- Free: all three tabs, limited to promoted stallions, with the rating, Stakes Winners Comparison, Side By-Side Comparison, Aptitude Profile and AI Name Assistant. The first tab is labelled Promoted Stallions.
- Plus: opens Any Stallion to every sire in the database, and adds View Interactive Pedigree, Dosage Summary, a choice of themes in the AI Name Assistant and the price range achieved by close family members in the Sibling Sales Snapshot.
- Pro: everything in Plus, with each sibling's sale price and race performance in the Sibling Sales Snapshot.
The seven day trial includes the paid tools. See Plan Entitlements: Free, Trial, Plus and Pro and How to Upgrade Your Account.
Why hypothetical matings matter
Every match is a hypothetical mating: a pairing that has not happened, analysed exactly as a real horse would be. Mating decisions have to be made before any evidence about the foal exists, and often before much evidence about the stallion exists either. Analysing the pedigree the mating would produce brings data to that decision at the time it is actually made.