Know which yearlings to buy Buy the yearlings built to win.

A bespoke equine biomech model for buyers who measure before they bid.

The eight numbers

The Eight Furlong Edge.

One standard behind every number: mature horses with complete race records, top-rated vs bottom-rated at the same price. No buy-cheap effect, no survivorship trick.

01 · Marquee
+30%

More prize money per dollar

Top-rated yearlings returned 30% more prize money per dollar than bottom-rated — at the same price. On our most complete cohort yet, holding across both sexes and every complete vintage. Price- and survivorship-controlled.

n = 6,127 · same-price, complete records
02 · Within-sire
+31%

Same sire. More return.

Choosing between two foals of the same sire? Across 142 sires, our top-rated progeny returned 31% more per dollar — pedigree and price held constant. The one number that beats both "you just bought cheap" and "you just bought the right sire."

142 sires · pedigree + price controlled
03 · Durability
1.34×

Still racing at 30 starts

19.4% vs 14.5%. Top-rated yearlings are a third more likely to still be racing deep into their careers — when the real money is paid. Soundness is the edge.

n = 6,127 · same-price
04 · Both sexes
+38% / +22%

Fillies / Colts

The value edge holds on both sides of the catalogue — +38% for fillies, +22% for colts. Not a fluke of one population.

same standard, split by sex
05 · Stability
+18–35%

Across three complete vintages

The prize-money-per-dollar edge is positive across every yearling vintage with mature careers (2020–22). A repeatable signal, not a single-year fluke.

2020–2022 · same standard
06 · Rarity
1 in 16

Net +6 = top 6.3%

The signal is rare on purpose. Net +8 = top 1.5% / 1 in 66. Few horses clear it — and that's the point.

whole cohort · biomech score only
07 · Validation
6,127

Racehorses, full careers

The claims aren't modelled — they're measured against 6,127 mature Australian racehorses with complete career records. Real prices in, real prize money out.

AU validation cohort
08 · Reach
22,336

Yearlings measured

Every yearling we've put through the model — Inglis, Magic Millions and NZB, 2019 to 2026. The data asset behind every score.

operational cohort
The data

22,336 yearlings. Measured.

Every horse in the cohort, plotted on two of the biomech metrics that drive the score.

Distribution · Leg-to-body ratio
Spread · Head height vs Leg-to-body ratio
Colts & geldings Fillies & mares
22,336 measured · 6,127 mature horses with complete race records (validation)
Where the model doesn't work
“Above $300k the model loses traction — the market is too inefficient at the prestige end. Below that ceiling — where 7 out of 10 bids land — our top-rated yearlings return 30% more prize money per dollar at the same price.”
Framing what this is versus what this is not. It's not meant to pick the next Winx — it finds durable, hidden value. The class signal is flat by design; the value and durability signals are what hold up.
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Bring this data analysis to your next sale.

Briefings for bloodstock managers, syndicators and trainers. Eight Furlong is private and bespoke — we don't publish picks.