Mares & Foals

Zesterra® Helps Mares & Foals Excel Through Every Stage

Supporting the health of mares and foals takes more than just sound nutrition — it takes proactive management of gut health, stress resilience, and immune function. From gestation through foaling and weaning, Zesterra® offers targeted support to help mares and foals thrive through every stage.
Title

Stress and Cortisol: Protecting Reproductive Success

Stress impacts mares and foals at every stage. Elevated cortisol can lower progesterone in mares, increasing the risk of fetal loss or poor milk production, and can weaken both maternal and foal immunity.

Common stressors include:

  • Transportation for breeding
  • Weaning of foals
  • Isolation from herd mates
  • Poor nutrition or body condition
  • Environmental extremes (heat, cold, weather shifts)

Zesterra® helps buffer excess gastric acid and supports gut balance to reduce the physiological impacts of stress on mares and foals alike.
Title

Ulcer Prevention for Mares & Foals

Studies show that ~50% of foals and ~33% of mares and stallions confined to stalls develop ulcers — making prevention essential.

Contributing factors:

  • Irregular feeding schedules and limited forage
  • High-concentrate diets required during pregnancy and lactation
  • Increased exercise demands
  • Stress-related acid production

Zesterra® naturally helps:

  • Buffer stomach acid
  • Support a stable gut lining
  • Reduce the risk of ulcers in both mares and foals
Title

Building and Maintaining a Healthy Gut

A stable, diverse gut microbiome is vital to:

  • Nutrient absorption
  • Weight maintenance
  • Immune strength
  • Behavioral calmness

Zesterra® supports gut health by:

  • Neutralizing excess acid
  • Encouraging beneficial bacterial colonies
  • Helping reduce “Leaky Gut” risk
  • Supporting appetite and hydration during transitions
Title

Boosting Immunity During Critical Stages

Late gestation and early lactation are nutritionally and immunologically demanding for mares — which in turn impacts foal immunity.

Zesterra® provides essential support to:

  • Promote optimal nutrient uptake when demands are highest
  • Support passive immunity transfer from mare to foal
  • Reduce stress-related immune suppression

Adding natural liquid supplements rich in antioxidants, vitamin E, and omega-3s further enhances immune function and resilience.
Title

Support Growth and Vitality in Foals

Healthy foals require:

  • Adequate passive immunity through timely colostrum intake
  • Strong gut function to prevent early-life ulcers, GI issues, and foal scours
  • Stress resilience during weaning and early training

Zesterra®:

  • Supports appetite and encourages healthy nursing in the first critical hours
  • Helps buffer gastric acid and stabilize gut flora to reduce the risk of scours
  • Aids in establishing a strong digestive foundation and immune resilience
  • Supports appetite and hydration in foals during stressful transitions (weaning, transport)
Title

Give Your Mares & Foals a Healthy Advantage.


Whether you're supporting a pregnant mare, helping a foal through weaning, or managing a high-performance breeding program — Zesterra® provides natural, proven support for gut health, stress resilience, and immunity.

📞 Reach out today to learn how Zesterra® can fit into your breeding program.

💬 Or fill out the quick form below and we’ll get back to you within 1 business day.