Research, interpretation and practical applications of dosage analysis in the Thoroughbred.

Dosage analysis has fascinated students of the Thoroughbred for more than a century. From the early research of Lieutenant-Colonel J. J. Vuillier and Franco Varola's study of inherited aptitudes, through to Dr Steven Roman's development of the modern Dosage Index, the objective has remained the same:

To better understand the influences within a pedigree and how they contribute to the type of racehorse produced.

DosageProfile.com is dedicated to the practical application of dosage analysis — examining how dosage principles relate to real racehorses, significant races, breeding trends and the continuing evolution of the Thoroughbred.

While dosage theory provides the foundation, this website focuses on its application.

Dosage in Practice

A dosage profile is not a prediction of whether a horse will succeed or fail.

Rather, it provides insight into the inherited characteristics present within a pedigree and the balance of influences that may contribute to racing aptitude.

Through the study of major races, champions and historical trends, DosageProfile.com explores how dosage patterns appear among successful Thoroughbreds.

Research includes:

• Melbourne Cup winners
• Cox Plate winners
• Golden Slipper winners
• Caulfield Guineas winners
• Classic race performers
• Significant stallions and families
• Historical dosage trends

Understanding the Numbers

The modern interpretation of dosage uses recognised Chef-de-Race ancestors and evaluates their contribution across five traditional aptitudinal categories:

Brilliant
Speed and early maturity.

Intermediate
The transition between speed and classic ability.

Classic
The balanced qualities associated with championship racing.

Solid
Endurance and staying influence.

Professional
Long-distance stamina.

From these classifications, calculations such as the Dosage Index (DI) and Centre of Distribution (CD) provide a numerical representation of the balance within a pedigree.

These figures can reveal patterns — but they must always be interpreted within the broader context of the individual horse.

Historical Research

One of the most valuable uses of dosage analysis is examining the champions of the past.

By studying the dosage profiles of successful racehorses, we can explore questions such as:

• Do Melbourne Cup winners share common dosage characteristics?
• Has the profile of elite two-year-olds changed over time?
• What influences appear repeatedly among Cox Plate champions?
• How have breeding trends altered the modern Thoroughbred?

DosageProfile.com preserves these studies as an ongoing record of research into the relationship between pedigree and performance.

Australian and New Zealand Perspective

Much of the historical discussion surrounding dosage has focused on Northern Hemisphere racing populations.

However, Australia and New Zealand have developed a distinctive Thoroughbred population shaped by unique sire lines, racing conditions and breeding philosophies.

Through the inclusion of Australasian Chef-de-Race influences and the analysis of local racing results, DosageProfile.com aims to contribute to a more complete understanding of the Southern Hemisphere Thoroughbred.

More Than a Number

The greatest value of dosage analysis lies not in the calculation itself, but in the questions it allows us to ask.

Why do some pedigrees produce exceptional racehorses?

Why do certain sire lines repeatedly appear in champions?

Why do some horses succeed beyond what their pedigree suggests, while others fail to fulfil expectations?

Dosage provides one perspective.

Pedigree, conformation, biomechanics, environment and individual ability complete the picture.

The purpose of DosageProfile.com is not to replace judgement, but to provide another tool for understanding the world's most fascinating athlete — the Thoroughbred.

Part of the Turf Monthly Research Network

DosageProfile.com forms part of the Turf Monthly Research Network, an independent collection of resources dedicated to the history, breeding, analysis and understanding of the Thoroughbred.

Turf Monthly
Exploring the history, heritage and future of the Thoroughbred.

Chef-de-Race
The reference source for influential stallions and Chef-de-Race classifications.

Dosages
Understanding the history, theory and evolution of dosage analysis.

Progold Thoroughbreds
Independent pedigree, biomechanical and bloodstock analysis for serious Thoroughbred investors.

Together, these resources combine historical research, analytical study and practical experience to provide a deeper understanding of the Thoroughbred.