When a Young Horse’s Phosphorous Level Is Elevated It Could Be A Sign Of A Growth Spurt: How to Train Carefully to Prevent Fractures
- firstchoiceequine

- 23 hours ago
- 4 min read
Young horses grow fast. Their bodies change quickly, and their bones develop in ways that need special care. One sign of this growth is a high phosphorous level in their blood. This can mean the horse is in a growth spurt. During this time, training must be handled carefully to avoid injuries like fractures. I want to share what I have learned about this important topic and how to keep young horses safe and healthy.
Understanding Phosphorous Levels in Young Horses
Phosphorous is a mineral that plays a key role in bone development. It works closely with calcium to build strong bones and teeth. When a young horse’s phosphorous level is high, it often means the horse is growing rapidly. This is normal, but it also means the bones are still forming and may be more fragile.
High phosphorous levels can be detected through blood tests. These tests help horse owners and trainers understand the horse’s growth stage. Knowing this helps adjust feeding and training plans to support healthy development.
Young horses need the right balance of minerals. Too much or too little phosphorous can cause problems. For example, too much phosphorous compared to calcium can weaken bones. This imbalance can increase the risk of fractures during training.
Why Growth Spurts Make Training Risky
During a growth spurt, a horse’s bones lengthen and harden. This process is called ossification. It takes time, and the bones are softer and more flexible at first. This softness means the bones can break more easily if the horse is pushed too hard.
Training young horses during growth spurts requires patience. Sudden or intense exercise can cause stress on the bones. This stress can lead to fractures or other injuries. It is important to build strength slowly and avoid overloading the horse.
I have seen cases where young horses were trained too hard too soon. The result was painful fractures that took months to heal. These injuries could have been avoided with better timing and care.
Signs That a Young Horse Is in a Growth Spurt
You can watch for signs that a horse is growing fast. These include:
Rapid increase in height or weight
Changes in appetite, often eating more
Slight stiffness or soreness after exercise
High phosphorous levels in blood tests
If you notice these signs, it is a good idea to check the horse’s mineral levels. This helps confirm if the horse is in a growth spurt and needs special care.
How to Train Young Horses Safely During Growth Spurts
Training should focus on building strength without causing damage. Here are some tips:
Use light, low-impact exercises like walking and trotting
Avoid hard surfaces that increase bone stress
Limit training sessions to short periods with rest in between
Monitor the horse’s behavior and look for signs of pain or fatigue
Adjust training based on blood test results and growth signs
It is also important to provide a balanced diet that supports bone health. Calcium and phosphorous should be in the right ratio, usually around 1.5 to 2 parts calcium to 1 part phosphorous.

Young horse’s leg during a growth spurt, highlighting the importance of careful training.
Monitoring and Adjusting Training Over Time
Growth spurts do not last forever. After a few months, the horse’s bones will harden more. Training can then increase gradually. Regular blood tests help track phosphorous and calcium levels. This information guides when to step up training intensity.
Working with a veterinarian or equine nutritionist is very helpful. They can recommend the best feeding and training plans based on the horse’s growth and health.
Preventing Fractures with Proper Care
Fractures are serious injuries that can end a horse’s career. Preventing them means respecting the horse’s growth stages. Here are key points to remember:
Avoid heavy training during high phosphorous phases
Provide soft, safe footing for exercise
Watch for signs of discomfort or lameness
Consult professionals for blood testing and training advice
By following these steps, you reduce the risk of fractures and help your young horse grow into a strong, healthy adult.

Young horse walking on soft grass to reduce stress on developing bones.
The Role of Balanced Nutrition in Growth Spurts
Nutrition is the foundation of healthy growth. Young horses need enough energy, protein, vitamins, and minerals. Phosphorous and calcium are the most important minerals for bones.
Good pasture and hay also contribute to balanced nutrition. Always check the quality of feed and adjust supplements as needed.
Final Thoughts on Training Young Horses in Growth Spurts
Training a young horse during a growth spurt requires care and knowledge. High phosphorous levels signal that the horse’s bones are still developing. This means training should be gentle and gradual to avoid fractures.
Remember, patience is key. A young horse that grows strong and healthy will perform better and stay sound longer. Take the time to understand your horse’s growth and adjust training accordingly. This approach protects your horse and builds a solid foundation for a successful future.

Young horse resting in paddock to recover and support healthy growth.
If you want to learn more about supporting your young horse’s health during growth spurts, check out First Choice Equine for trusted products and expert advice. Taking care of your horse’s bones today means a stronger tomorrow.
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