Should I Worm My Mare After Foaling? A Comprehensive Guide
The answer to “Should I worm my mare after foaling?” is a resounding yes, typically, but with important considerations. Strategic deworming is crucial for the mare’s health and the foal’s well-being, but selecting the appropriate dewormer and timing it correctly are paramount.
Understanding Post-Foaling Worm Burdens
Following foaling, mares often experience a temporary reduction in their immune function, making them more susceptible to internal parasites. This is compounded by the fact that the mare is now shedding parasite eggs in her feces, potentially exposing the vulnerable foal to infection. Knowing the common types of worms and how they affect both mare and foal is essential.
- Small Strongyles (Cyathostomins): The most common and often most concerning equine parasite. Encysted larvae in the gut wall can emerge in large numbers, causing severe illness.
- Large Strongyles (Strongylus vulgaris): Once a major problem, now less common due to effective dewormers. Larvae migrate through the bloodstream, damaging arteries.
- Roundworms (Parascaris equorum): Primarily affect young horses. Foals can develop immunity to these by adulthood.
- Tapeworms (Anoplocephala perfoliata): Attach to the junction of the small and large intestines, potentially causing colic.
- Threadworms (Strongyloides westeri): Can be transmitted to foals through the mare’s milk.
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Benefits of Post-Foaling Deworming
Should I worm my mare after foaling? Absolutely, and here are the key reasons:
- Protecting the Foal: Reducing the mare’s parasite burden minimizes the foal’s exposure to infective stages. This is especially crucial because foals have immature immune systems and are more susceptible to the harmful effects of parasites.
- Improving Mare’s Health: Deworming helps the mare recover after the energy-intensive process of pregnancy and foaling. A healthy mare can produce more milk and better care for her foal.
- Preventing Pasture Contamination: Deworming reduces the shedding of parasite eggs into the environment, contributing to overall parasite control on the farm.
- Reducing the Risk of Colic: A heavy worm burden can lead to colic in both mares and foals. Deworming helps prevent this potentially life-threatening condition.
Selecting the Right Dewormer
Choosing the appropriate dewormer is crucial, and a veterinarian’s advice is highly recommended. Factors to consider include:
- Type of Parasites: Different dewormers are effective against different types of worms. Fecal egg counts (FEC) can help identify which parasites are present.
- Drug Resistance: Resistance to certain dewormers is a growing concern. Rotating dewormers can help prevent resistance, but only if done strategically.
- Safety for Foals: Some dewormers are not safe for use in young foals. Consult your veterinarian to ensure the chosen dewormer is safe for both the mare and the foal.
- The Mare’s Weight: Accurate weight estimation is essential for proper dosing. Overdosing can be harmful, while underdosing can lead to resistance.
Common dewormer active ingredients and their uses include:
| Active Ingredient | Effective Against | Considerations |
|---|---|---|
| — | — | — |
| Ivermectin | Roundworms, Lungworms, Some External Parasites | Widespread resistance in small strongyles is a concern |
| Moxidectin | Broad Spectrum, Including Encysted Small Strongyles | Longer duration of efficacy; avoid in debilitated animals |
| Fenbendazole | Roundworms, Hookworms, Some Tapeworms | Resistance is common |
| Pyrantel Pamoate | Roundworms, Some Strongyles | Available as a daily feedthrough |
| Praziquantel | Tapeworms | Often combined with other dewormers |
| Oxfendazole | Broad Spectrum | Less commonly used due to resistance |
Timing is Everything
The timing of post-foaling deworming is just as important as the choice of dewormer. A common approach is to deworm the mare shortly after foaling (within 24-48 hours) and then again in conjunction with the foal’s deworming schedule.
- Consultation is Key: The ideal deworming protocol will vary depending on the specific situation and regional parasite prevalence. Always consult with your veterinarian to develop a customized deworming plan for your mare and foal.
- Strategic Timing: Deworming should ideally coincide with peak egg shedding by the mare. This typically occurs in the spring and fall.
Avoiding Common Mistakes
- Underdosing: This is a major contributor to dewormer resistance. Always weigh your mare accurately and use the correct dosage.
- Overdosing: While less common than underdosing, overdosing can be toxic. Follow the product label carefully.
- Ignoring Fecal Egg Counts: FECs can help you determine if your deworming program is working and identify resistant parasites.
- Treating All Horses the Same: A targeted deworming approach is more effective and helps prevent resistance. Deworming all horses at the same time is generally not recommended.
- Failing to Manage the Environment: Good pasture management practices, such as rotating pastures and removing manure, are essential for parasite control.
Pasture Management and Hygiene
Deworming is only one piece of the puzzle. Effective parasite control requires a comprehensive approach that includes pasture management and hygiene practices.
- Manure Removal: Regular removal of manure from pastures helps reduce the number of parasite eggs available for ingestion.
- Pasture Rotation: Rotating pastures allows heavily grazed areas to recover and reduces parasite buildup.
- Harrowing: Harrowing breaks up manure piles and exposes parasite eggs to sunlight, which can kill them.
- Stocking Density: Avoid overgrazing pastures, as this increases the risk of parasite infection.
- Composting Manure: Properly composted manure is less likely to contain viable parasite eggs.
Frequently Asked Questions (FAQs)
What are the risks of not deworming my mare after foaling?
The risks of not deworming include increased parasite burden for the mare, leading to weight loss, poor milk production, and increased susceptibility to disease. More importantly, the foal is at a higher risk of becoming infected with parasites, which can lead to poor growth, colic, and even death. Early parasite control is critical for foal health.
Is it safe to deworm my mare while she is lactating?
Yes, most dewormers are safe for use in lactating mares. However, it’s crucial to consult with your veterinarian to ensure you choose a dewormer that is approved for use in lactating animals and won’t harm the foal through the milk.
How soon after foaling Should I worm my mare after foaling??
The ideal timing varies, but deworming within 24-48 hours after foaling is a common practice to reduce the initial parasite burden. Discuss the optimal timing with your veterinarian based on your specific situation and the parasites prevalent in your area.
What if my mare is already on a daily dewormer?
Even if your mare is on a daily dewormer, it’s important to discuss with your veterinarian whether an additional deworming treatment is necessary after foaling. Daily dewormers primarily target specific parasites and may not provide complete protection against all types.
Can I rely solely on fecal egg counts to determine if my mare needs deworming?
While FECs are a valuable tool, they shouldn’t be the only factor determining your deworming strategy. Consider the mare’s history, age, overall health, and the parasite prevalence in your area. A comprehensive approach is essential.
What is the best dewormer for pregnant mares?
Not all dewormers are safe for pregnant mares. Consult your veterinarian to determine the safest and most effective dewormer during pregnancy. Some dewormers are safe up until foaling, while others should be avoided.
How often should I deworm my mare throughout the year?
The frequency of deworming depends on various factors, including the mare’s age, health, and exposure to parasites. A targeted deworming approach based on FECs and veterinarian recommendations is generally more effective than a blanket deworming schedule.
What are the signs of a heavy worm burden in a mare?
Signs of a heavy worm burden can include weight loss, poor coat condition, lethargy, colic, diarrhea, and a pot-bellied appearance. If you observe any of these signs, consult your veterinarian promptly.
Is it possible for my mare to develop resistance to dewormers?
Yes, parasite resistance to dewormers is a growing concern. Overuse and improper use of dewormers contribute to resistance. Strategic deworming, based on FECs and veterinarian advice, can help slow the development of resistance.
How can I test for dewormer resistance on my farm?
A fecal egg count reduction test (FECRT) can be used to assess dewormer efficacy. This involves performing FECs before and after deworming to determine the percentage reduction in egg shedding. Consult your veterinarian to perform and interpret the FECRT.
Are there any natural alternatives to chemical dewormers?
While some natural remedies may have mild antiparasitic properties, they are generally not as effective as chemical dewormers. Natural alternatives should not be used as a substitute for veterinary-recommended deworming protocols, especially in vulnerable animals like mares and foals.
What role does nutrition play in parasite control for mares?
Good nutrition is essential for a healthy immune system, which helps the mare resist parasite infections. Ensure your mare receives a balanced diet with adequate protein, vitamins, and minerals to support her immune function. Proper nutrition is a key component of overall parasite management.