Letter to a Racehorse Owner Client

Building a Racehorse From the Inside Out

Your experience with Thrive Feed in your retired Thoroughbred is particularly relevant to what you are now facing with your three-year-old.

A greenstick fracture in a young horse naturally makes us think about bone strength. However, when people talk about bone nutrition, the conversation very quickly turns to calcium, phosphorus and trace minerals.

That is only part of the story.

Bone is not simply mineral. It is a living, dynamic composite structure built around an organic protein matrix, predominantly type I collagen.

The horse must first manufacture that collagen-rich structural matrix (framework). Minerals, principally calcium and phosphorus in the form of hydroxyapatite, are then incorporated into this structure. Both components are totally essential, but they perform very different mechanical functions.

Collagen Gives Bone Its Flexural Tolerance

This is vitally important in an athletic horse. The mineral component gives bone much of its hardness, stiffness and resistance to compression loading. The collagen-rich organic matrix contributes greatly to its toughness, tensile properties and ability to tolerate deformation and bending without catastrophic failure.

In practical terms, it contributes to what I describe as the bone’s flexural tolerance. Bone must not only be strong, but it must also possess an appropriate combination of strength, stiffness and toughness.

At a gallop, a Thoroughbred's limbs are repeatedly subjected to enormous dynamic forces. Bone experiences compression, tension, bending and torsional loads thousands of times during training and racing.

A useful analogy is reinforced concrete. Steel is the framework and concrete is the mineral.

The mineral component provides tremendous compressive strength, while the collagen matrix helps provide the toughness and tensile characteristics necessary for the structure to tolerate complex loading.

A racehorse therefore needs more than well-mineralised bones. It needs biologically well-constructed bones.

Building Bone Begins Before Birth

The nutritional history of a racehorse begins long before it reaches a racetrack; it begins with the mare during gestation. It continues through lactation, weaning, growth, breaking-in, early training and finally the enormous physiological demands of racing.

The quality and balance of nutrition during these developmental periods influence the raw materials available for the formation of bone, cartilage, tendons, ligaments and muscle. Genetics, exercise, growth rate, protein and amino-acid supply, energy intake, mineral balance and numerous other factors all contribute to skeletal development.

There is no single nutritional explanation for a fracture, and a fracture should never automatically be interpreted as evidence of nutritional deficiency. However, nutrition is one of the important variables that we can control.

Protein Is About Far More Than Muscle

Collagen is a protein. The horse therefore requires an adequate supply and appropriate balance of amino acids to manufacture, maintain, and continually remodel the collagen matrix upon which healthy bone depends. Those amino acids reflect the horse’s entire nutritional system. They include protein supplied and digested from quality forage and complementary feed, together with the nutritional contribution associated with the enormous microbial population responsible for fermentation within the hindgut.

This is why I have always regarded the horse as an integrated biological system rather than treating protein, fibre, energy, minerals and gastrointestinal function as unrelated subjects. Protein is not simply something we feed to build muscle.

It is involved in the construction and maintenance of:

• the collagen matrix of bone

• cartilage

• tendons and ligaments

• skeletal muscle

• enzymes

• transport proteins

• many of the tissues involved in repair, adaptation and athletic performance.

Minerals are obviously essential, but mineralisation can only be as useful as the biological structure being mineralised.

We cannot think intelligently about bone nutrition simply by asking how much calcium is in the diet.

Why This Matters to a Three-Year-Old Thoroughbred

A three-year-old racehorse is in a particularly demanding biological situation. It is still a relatively young animal whose skeleton is continually adapting and remodelling, yet it is simultaneously being exposed to the extraordinary mechanical demands of athletic training.

A greenstick fracture is an incomplete fracture in which the bone has bent and partially failed rather than separating completely.

The immediate priority must, of course, be appropriate veterinary diagnosis, treatment, rehabilitation and management. No feed can repair a fracture by itself, and Thrive Feed should never be represented as a substitute for veterinary treatment. What nutrition can do is provide the biological system with the raw materials required while the body carries out the remarkable processes of repair, remodelling and subsequent adaptation.

That means thinking about the whole horse, not simply the fracture.

Why Thrive Feed Is Relevant to the Racehorse

Thrive Feed was not developed around the conventional idea that athletic horses simply require more concentrated energy. Its nutritional philosophy was built around understanding horses performing extraordinarily demanding work, including historically the demands placed upon war horses. Those horses required endurance, structural resilience, recovery and the ability to continue performing after prolonged physical effort. The modern Thoroughbred faces a different task, but an important physiological principle remains.

Ultimate speed is finite.

A horse cannot accelerate indefinitely. Among horses of comparable ability, the decisive difference is frequently not simply which horse can attain the greatest instantaneous velocity.

It is which horse can reach racing velocity and maintain that velocity for longer before fatigue produces deceleration.

Races Are Won Through Maintenance of Velocity

Consider two horses with very similar maximum speeds. Both can reach approximately the same velocity. In the final stages of the race, however, one begins to decelerate more rapidly. The other horse may not actually be accelerating. It may simply be losing velocity more slowly. To the observer, the second horse appears to surge past. In reality, it may simply be maintaining velocity better.

That is maintenance of velocity.

This distinction is fundamental to the way I think about racehorse nutrition. The objective is not simply to put more energy into a horse in an attempt to manufacture greater speed. The objective is to support the entire physiological system that allows the horse to express its genetic ability, perform efficiently and resist fatigue. That includes gastrointestinal function, muscle metabolism, hydration, recovery and the continual maintenance and remodelling of bone and connective tissue.

The Objective Is Structural and Metabolic Resilience

Your retired Thoroughbred has already demonstrated to you the difference that a change in nutritional management can make. Your three-year-old presents a different challenge. This horse is still developing, has sustained a greenstick fracture and, following appropriate veterinary rehabilitation, may eventually return to the demands of athletic training.

I would therefore look beyond simply asking:

“How do we heal this fracture?”

I would also ask:

“How do we nutritionally support the whole horse so that its skeleton, connective tissues, muscles, gastrointestinal system and metabolism are as well prepared as possible for the workload we intend to place upon them?”

That is where the philosophy behind Thrive Feed becomes particularly relevant. We cannot change the horse’s genetic ceiling for speed. We cannot guarantee that any horse will remain injury-free, and nutrition cannot turn an ordinary horse into a champion. What we can do is provide a nutritional environment designed to allow the horse to make the best possible use of the genetic ability it already possesses.

For the skeleton, that means recognising something fundamental:

Healthy bone requires both mineral strength and a high-quality collagen matrix. The mineral component provides stiffness and compressive strength, while the collagen-rich matrix provides toughness and contributes critically to the bone’s tensile properties and flexural tolerance.

For the racehorse, the same principle extends to the entire animal.

It is not simply about producing speed.

It is about building and maintaining a horse capable of tolerating the forces required to produce that speed, and maintaining velocity when the horses around it begin to slow down.

That is where races are won!