How do you stop mares coming into season?

Table of Contents

Stopping a mare from coming into season, or suppressing estrus, can be achieved through various methods including hormonal treatments, surgery, and management techniques. These methods effectively control undesirable behaviors and physiological changes associated with the estrous cycle.

Introduction: Understanding the Mare’s Estrus Cycle

The estrous cycle, or heat cycle, in mares is a natural and necessary part of their reproductive physiology. However, the behavioral changes associated with estrus, such as increased vocalization, irritability, and decreased performance, can be problematic for owners and trainers. Understanding the reasons for wanting to control this cycle is crucial before exploring available options. How do you stop mares coming into season? The answer is multifaceted, involving a careful consideration of the mare’s health, intended use, and owner preferences.

Why Stop a Mare’s Heat Cycle? Benefits & Considerations

Suppressing a mare’s heat cycle offers several potential benefits:

Improved Performance: Reduced distraction and irritability can lead to enhanced focus and better performance in riding and competition.
Enhanced Temperament: Mares in heat can exhibit unpredictable and challenging behaviors. Stopping the cycle can result in a more consistent and manageable temperament.
Prevention of Unwanted Pregnancy: In situations where breeding is not desired, suppressing estrus provides a reliable form of contraception.
Management of Estrus-Related Pain: Some mares experience significant discomfort during estrus, and cycle suppression can alleviate this pain.

However, it’s important to consider the potential downsides:

Cost: Hormonal treatments and surgical procedures can be expensive.
Potential Side Effects: Some treatments can have side effects, although these are generally rare.
Reversibility: Some methods, like surgical sterilization, are permanent.
Impact on Future Breeding Potential: Although many methods are reversible, prolonged suppression may impact future fertility in some cases.

Methods to Suppress the Estrus Cycle

Several methods are available to control a mare’s estrous cycle. The choice depends on the individual mare and the owner’s goals.

Hormonal Treatments:
- Progesterone (Regu-Mate): This is the most common method. Progesterone mimics the hormone produced during pregnancy, preventing the mare from coming into heat. It is administered orally, typically daily.
- Altrenogest (Synthetic Progesterone): Similar to Regu-Mate, altrenogest is a synthetic progesterone that suppresses estrus.
- GnRH Vaccine (Equity/Improvac): This vaccine stimulates the mare to produce antibodies against GnRH, thus shutting down ovarian activity. It usually requires an initial vaccination, followed by a booster.
- Intrauterine Devices (IUDs): IUDs can be placed in the uterus to disrupt the estrous cycle.
Surgical Sterilization (Ovariectomy):
- This involves the surgical removal of the ovaries. It is a permanent solution and eliminates estrous cycles completely. It is typically reserved for mares that will never be bred.
Management Techniques:
- Exposure to Light: Extending the mare’s exposure to artificial light can manipulate the estrous cycle, effectively shutting it down during winter.
- Marble Insertion: This involves placing a marble into the mare’s uterus which mimics the presence of an embryo and can suppress cycling. Its effectiveness is variable.

Comparing Treatment Options

Treatment	Method	Reversibility	Cost	Side Effects	Duration of Effect
——————-	————-	————-	———–	—————————————————————	—————————————————–
Progesterone	Hormonal	Yes	Moderate	Vaginal discharge, rare allergic reactions	While administered
Altrenogest	Hormonal	Yes	Moderate	Similar to progesterone	While administered
GnRH Vaccine	Immunization	Potentially	Moderate	Injection site reactions, potential long-term infertility	Variable, typically several months to a year
IUDs	Mechanical	Yes	Low	Uterine infection, expulsion	Variable, months to years
Ovariectomy	Surgical	No	High	Surgical complications, anesthetic risks	Permanent
Extended Light	Environmental	Yes	Low	None	While light exposure is maintained
Marble Insertion	Mechanical	Yes	Very Low	Uterine inflammation, infection, expulsion	Variable, unpredictable

Potential Side Effects and Considerations

While generally safe, each method for controlling estrus can have potential side effects.

Hormonal Treatments: Progesterone can sometimes cause vaginal discharge. GnRH vaccines, while effective, may lead to longer-term infertility issues in some mares.
Surgical Sterilization: As with any surgery, there are risks of infection, bleeding, and complications related to anesthesia.
Management Techniques: Light manipulation requires consistent implementation, and marble insertion is unreliable and carries a risk of uterine infection.

How do you stop mares coming into season? Understanding the potential downsides of each approach is just as important as knowing the benefits. Consulting with a veterinarian is crucial to determine the most appropriate method for each individual mare.

Common Mistakes to Avoid

Self-Diagnosing and Treating: Always consult with a veterinarian before starting any treatment to suppress estrus.
Inconsistent Administration: Hormonal treatments require consistent administration to be effective. Missed doses can lead to breakthrough estrus.
Ignoring Underlying Health Issues: Sometimes, abnormal estrous cycles can be a symptom of an underlying health problem. Address any health concerns before focusing solely on estrus suppression.
Expecting Immediate Results: Some treatments, like the GnRH vaccine, take time to become fully effective. Be patient and follow your veterinarian’s instructions.

Frequently Asked Questions (FAQs)

Will Regu-Mate or Altrenogest permanently affect my mare’s fertility?

Generally, Regu-Mate and altrenogest are reversible and do not permanently affect fertility. However, prolonged use may, in rare cases, impact future breeding potential. Always consult with a veterinarian regarding long-term use and its potential effects on fertility.

Is the GnRH vaccine safe for all mares?

The GnRH vaccine is generally safe, but some mares may experience injection site reactions. There is also a small risk of long-term infertility. It’s essential to discuss the potential risks and benefits with your veterinarian.

How long does it take for Regu-Mate to start working?

Regu-Mate typically takes 3 to 5 days to suppress estrus behaviors. Consistent daily administration is crucial for maintaining its effectiveness.

Can I use Regu-Mate or Altrenogest on a pregnant mare?

No, Regu-Mate and Altrenogest are not approved for use in pregnant mares and could potentially harm the developing fetus.

Is surgical sterilization a humane option?

Surgical sterilization is generally considered a humane option when performed by a qualified veterinarian. It eliminates estrus-related behaviors and the potential for unwanted pregnancies.

Does exposure to artificial light affect all mares equally?

The response to artificial light can vary among mares. Some mares may respond more readily than others. The intensity and duration of light exposure also play a crucial role.

What is the success rate of marble insertion?

The success rate of marble insertion is variable and unpredictable. It is not a reliable method for estrus suppression and carries a risk of uterine infection.

My mare is still showing signs of heat even while on Regu-Mate. What should I do?

If your mare is showing signs of heat despite being on Regu-Mate, consult with your veterinarian. It could indicate incorrect dosage, improper administration, or an underlying health issue.

Can I stop Regu-Mate abruptly?

Abruptly stopping Regu-Mate can cause a rebound effect, potentially leading to a more intense estrus cycle. It’s best to wean off gradually under the guidance of your veterinarian.

Are there any natural alternatives to hormonal treatments for stopping a mare’s heat cycle?

While some owners use herbal remedies or dietary supplements, there is limited scientific evidence to support their effectiveness in reliably suppressing estrus.

How long does the GnRH vaccine last?

The duration of effect of the GnRH vaccine varies depending on the individual mare and the specific product used. It typically lasts for several months to a year.

How do you stop mares coming into season? – Which method is best for my mare?

The best method depends on individual circumstances, the mare’s use, and your veterinarian’s recommendations. A comprehensive evaluation of your mare’s health and your specific needs is crucial to determining the most suitable and effective approach. Consulting with an experienced equine veterinarian is the most important step you can take.