Healthy horse surrounded by floating zinc molecules.

Equine Nutrition: Optimizing Horse Health Through Diet and Supplementation

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Kai Mendoza in Health & Wellness October 2026 • 5 min read.

"Unlocking the secrets of equine nutrition: From zinc absorption to tailored diets, learn how to enhance your horse's well-being and performance."


The world of equine nutrition is constantly evolving, with new research providing valuable insights into how we can best support the health and performance of our horses. Recent studies shed light on everything from mineral absorption to the impact of dietary protein on horses with specific metabolic conditions.

This article delves into key findings from recent equine research, translating complex scientific data into actionable advice for horse owners. We'll explore how different forms of zinc supplements affect absorption rates, how high-protein meals impact insulin dynamics in horses with Equine Metabolic Syndrome (EMS), and the potential benefits of amino acid supplementation in pregnant mares.

Whether you're a seasoned equestrian or a passionate horse owner, understanding the nuances of equine nutrition is crucial for ensuring the well-being and athletic capabilities of your equine companion. Let's dive into the latest research and discover how you can optimize your horse's diet for a healthier, more fulfilling life.

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Zinc Status and Dietary Supply in Horses

A 2023 study of horses and ponies reported that plasma zinc concentrations were widely unaffected by nutritional and non-nutritional factors, while mane hair samples better reflected dietary zinc supply. The study also noted that little is known about animal- and diet-related factors that may affect equine plasma zinc concentrations. Separately, Creature Feast reports that high iron in hay—giving 300 parts per million as a common example in many regions—may reduce zinc absorption, so a hay analysis can overstate the zinc available to a horse.

Zinc Testing and Mineral Interactions

A conventional method for measuring zinc is atomic absorption, but the cited study describes this procedure as complex and difficult to apply in clinical settings. It reports that a simpler method was developed alongside growing understanding of serum zinc’s relationship with conditions including hepatic failure, gastric mucosa disorder, chronic renal failure, and diabetes. In equine diets, high iron levels—potentially associated with soil contamination, acidic or iron-rich soil, high rainfall, or runoff—can inhibit zinc and copper uptake, meaning dietary zinc may appear adequate even when deficiency symptoms occur.

Growing Attention to Zinc’s Biological Role

A 2018 review describes zinc as one of the most studied minerals of the twenty-first century and calls it the “calcium of twenty-first century,” reflecting its involvement in many bodily functions. The review emphasizes that zinc bioavailability depends on its source and on the processes of digestion, absorption, and metabolism. A 2023 equine paper notes that zinc supplements are often used to support skin and hoof quality or immune function, while reporting that data on dietary zinc’s effects on the intestinal microbiota of horses were lacking.

Boosting Zinc Absorption: The Key to Equine Health

Healthy horse surrounded by floating zinc molecules.

Zinc is an essential trace mineral that plays a vital role in various physiological processes in horses, including immune function, wound healing, and hoof health. Ensuring adequate zinc levels is crucial for maintaining overall equine well-being.

A recent study compared the absorption rates of zinc from different supplement formulations: BTZN (likely a brand name or specific type of organic zinc), inorganic zinc (INOR), and a control group (NC). The results indicated that BTZN significantly enhanced zinc absorption compared to INOR. BTZN supplementation led to higher maximum zinc levels in the plasma, indicating faster and more efficient uptake by the horse's body. This could lead to optimizing the dosage of Zinc for horses.

  • Faster Absorption: BTZN demonstrated a quicker absorption rate compared to inorganic zinc supplements.
  • Higher Plasma Levels: Ponies receiving BTZN achieved significantly higher zinc concentrations in their blood.
  • Optimized Supplementation: The findings suggest that BTZN may be a more effective option for raising zinc levels in horses.
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Research on Zinc Absorption and Animal Health

A 2025 review examines zinc metabolism across poultry, ruminants, and non-ruminants, including absorption dynamics, transport, tissue storage such as in the liver, and excretion pathways. It also reviews zinc’s effects on animal health. A separate source claims that organic zinc complexes bound to amino acids can be absorbed through the small-intestinal mucosa and are less susceptible to interference from other substances, but the supplied material does not provide study details to establish how broadly that claim applies.

Comparing Trace-Mineral Forms in Horses

A 2005 study compared absorption and retention of copper, manganese, and zinc in adult horses fed mineral supplements in oxide, sulfate, or organic-chelated forms. The supplied report excerpt says zinc absorption, absorption as a percentage of intake, retention, and retention as a percentage of intake were significantly greater (P<0.05) in Period 1 than in Periods 2 and 3. The excerpt does not identify which mineral form produced that difference, so it does not support ranking the forms by zinc absorption or retention.

These findings highlight the importance of considering the form of zinc when supplementing a horse's diet. Organic zinc sources, like BTZN, may offer superior bioavailability and lead to better overall zinc status. However, more research is needed to fully understand the long-term effects and optimal dosages for different horse populations and dietary conditions.

Key Takeaways: Tailoring Nutrition for Optimal Equine Health

The insights presented in these studies underscore the significance of individualized nutrition plans for horses. Factors such as zinc absorption rates, protein intake, and specific health conditions like EMS must be considered when formulating a diet.

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Measuring Serum Zinc Response

A 2002 study measured serum zinc directly in the flame using atomic absorption spectrometry. It compared differences between maximum zinc content in serum samples with a two-factor analysis of variance and the Tukey test. The supplied summary does not state the study’s results or identify which supplementation approach produced the highest serum zinc response.

Mineral Supplement Forms in Exercising Horses

A 2010 study set out to compare copper and zinc absorption and retention in exercising horses when the minerals were supplied in sulfate or organic-chelate form. The source excerpt identifies the study’s objective but does not provide its results. It therefore supports describing the practical comparison being investigated, but not claiming that either supplement form improved absorption or retention.

By understanding how different nutrients and supplements affect a horse's physiology, owners and caretakers can make informed decisions to optimize their animal's well-being and athletic performance. Consulting with an equine nutritionist or veterinarian is highly recommended to create a personalized plan that meets the unique needs of each horse.

As equine research continues to advance, staying informed about the latest findings will be crucial for providing the best possible care. Embracing a proactive approach to nutrition, based on scientific evidence, is the key to unlocking the full potential of our equine partners.

Reading the insulin-response findings

The shorter clearance time in the supplemented group is consistent with greater insulin sensitivity in that comparison. It does not establish that the supplement has the same effect in other settings or alongside every diet.[1] [2]

Across the diets tested, insulin-dysregulated horses had greater insulin responses than non-insulin-dysregulated horses. The findings describe a difference between groups, not a single response that applies to every horse.[3]

How diet and weight comparisons frame insulin response

Ponies with insulin dysregulation showed greater post-meal insulin peaks than healthy ponies while grazing the same pasture, placing the group difference in a shared feeding context.[4]

The reported higher risk of insulin dysregulation among horses with no exercise is an association; it does not show that exercise caused the difference.[5]

The nutraceutical comparison sits alongside evidence that dietary restriction with ScFOS did not add insulin-sensitising effects beyond restriction, so the findings do not establish a general supplement benefit across management settings.[2]

  • How should insulin results from different laboratory assays be compared when their values can differ substantially?[6]
  • In the grazing comparison, were the day-to-day changes in glucose, insulin, and GIP driven by pasture intake or by intestinal glucose absorption?[4]
  • How much of the improvement in insulin sensitivity reflects baseline insulin resistance and body-condition losses, rather than the added sc-FOS?[7]

Questions about EMS indicators

Does high triglyceride concentration reliably diagnose EMS?

No. Hypertriglyceridemia has been identified as a predictor of laminitis in ponies with EMS, but its changes are mild and inconsistent and it has not proved to be a reliable diagnostic test.[6]

Does metformin improve insulin sensitivity in horses?

The cited account reports low oral bioavailability and more recent research showing no efficacy on insulin sensitivity in normal or insulin-resistant horses.[2]

Sources

  1. Nutraceutical Supplement Mitigates Insulin Resistance in Horses with a History of Insulin Dysregulation During a Challenge with a High-Starch Diet (pmc.ncbi.nlm.nih.gov)
  2. Equine metabolic syndrome (pmc.ncbi.nlm.nih.gov)
  3. Postprandial insulin responses to various feedstuffs differ in insulin dysregulated horses compared with non-insulin dysregulated controls. (pubmed.ncbi.nlm.nih.gov)
  4. Insulin and incretin responses to grazing in insulin‐dysregulated and healthy ponies (pmc.ncbi.nlm.nih.gov)
  5. Variation in insulin response to oral sugar test in a cohort of horses throughout the year and evaluation of risk factors for insulin dysregulation (pmc.ncbi.nlm.nih.gov)
  6. ECEIM consensus statement on equine metabolic syndrome (pmc.ncbi.nlm.nih.gov)
  7. Dietary restriction in combination with a nutraceutical supplement for the management of equine metabolic syndrome in horses. (pubmed.ncbi.nlm.nih.gov)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

Why is zinc important for horses?

Zinc is a vital trace mineral for horses, critical for immune function, wound healing, and hoof health. The type of zinc supplement significantly impacts its absorption. The article highlights a study comparing BTZN to INOR, where BTZN showed enhanced absorption, leading to higher zinc levels in the horse's plasma. This suggests that using organic zinc sources, like BTZN, may be more effective for improving a horse's zinc status, which is essential for overall equine well-being.

2

What is the difference between BTZN and INOR?

The difference lies in how well the horse's body can absorb and utilize it. The research mentioned in the text compared BTZN, an organic zinc supplement, with INOR, an inorganic zinc supplement. BTZN showed a faster absorption rate, resulting in higher zinc concentrations in the blood compared to INOR. This higher bioavailability means BTZN is more efficiently absorbed, potentially leading to better outcomes in terms of zinc's role in maintaining equine health. While the article doesn't delve into the specific mechanisms of absorption, it stresses that the form of zinc is important.

3

What are the benefits of zinc for a horse?

Zinc is essential for several key processes in horses. It plays a crucial role in immune function, helping the horse fight off infections. It's also important for wound healing, allowing the body to repair itself effectively. Furthermore, zinc contributes to healthy hoof development. By ensuring adequate zinc levels through proper nutrition and supplementation, horse owners can support their horse's overall health, ensuring better performance and longevity.

4

Why does the article stress tailored nutrition plans?

The article emphasizes the importance of tailored nutrition plans for horses. It states that factors such as zinc absorption rates (e.g., the use of BTZN versus INOR), protein intake, and specific health conditions like Equine Metabolic Syndrome (EMS) must be considered when creating a diet. Individualized nutrition plans, taking into account these elements, can lead to better health and athletic performance. The text underscores that one-size-fits-all approaches are not ideal, and each horse's diet should be customized to its specific needs.

5

What other nutritional aspects besides zinc are mentioned?

While the article focuses primarily on zinc absorption, it mentions the impact of protein-rich diets on horses with Equine Metabolic Syndrome (EMS) and the potential benefits of amino acid supplementation in pregnant mares. Unfortunately, details of these key insights are not discussed. The article focuses on highlighting the importance of staying informed about the latest research, and of adjusting diets accordingly. More research may be needed to fully understand the optimal dosages for different horse populations and dietary conditions.

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