BioWorma: How It Works, Which Product You Need, and Where to Buy

Deworming an animal handles the parasites already inside it. It doesn't touch the ones waiting on the pasture. Every time a treated animal grazes, it can pick up new larvae from the same ground, and within weeks the worm burden creeps back to where it started. This reinfection cycle is what makes parasite control in grazing animals so hard to get ahead of, no matter how good the dewormer is.

BioWorma approaches the problem from a different angle. Instead of treating the animal, it treats the pasture by way of the manure the animal leaves behind.

What Is BioWorma?

BioWorma is a biological control agent based on a natural soil fungus, Duddingtonia flagrans, strain IAH 1297. It's mixed into feed and fed daily, and it works entirely outside the animal's body.

This is the part that trips people up at first: BioWorma doesn't kill worms living inside a sheep, goat, cattle, or horse. It has no effect within the host animal at all. What it does is interrupt the next generation of parasites before they ever make it back onto the grass.

How Does BioWorma Work?

The fungal spores in BioWorma are thick-walled, which means they resist digestion and pass through the animal's gut completely intact. Once they're in the manure, the spores germinate and form small trapping structures, and those structures physically capture, paralyze, and consume the worm larvae developing in that same manure pile, larvae that would otherwise migrate onto the pasture. Fewer larvae make it out. Less pasture gets contaminated. The herd grazing there next picks up less infective material.

The manufacturer's datasheet describes BioWorma as beginning to work "immediately within the manure." Still, the visible payoff shows up over the following weeks, as pasture contamination trends downward instead of resetting every grazing cycle.

Why Pasture Management Matters as Much as Treating the Animal

Most of the gastrointestinal nematodes affecting sheep, goats, cattle, and horses spend part of their life cycle outside the animal, as eggs and larvae develop in manure and on pasture. A dewormer only reaches the worms currently inside the animal. It does nothing to the population already sitting on the ground, and that population is exactly what reinfects the herd a few weeks later.

This is why chemical deworming programs alone tend to plateau. You can treat the same animal every season and still be fighting the same pasture load, because the source of reinfection was never addressed. BioWorma targets that missing piece, and it does so against chemical- and multi-resistant larvae as effectively as susceptible ones, since the trapping mechanism doesn't rely on a chemical pathway at all.

What BioWorma Does Not Do

Worth saying plainly: BioWorma is not a dewormer, and it isn't a replacement for one. It does not kill adult worms already living inside an animal; it does not treat an active infection, and it does not clear existing pasture contamination overnight. Contamination that's built up over time takes sustained daily feeding to bring down, not a single dose.

The manufacturer's directions are explicit about sequence: treat the animal with an appropriate chemical wormer first, then begin BioWorma to keep the pasture clean going forward. Skipping that first step and expecting BioWorma alone to resolve an active worm burden misunderstands what the product is built for.

What the Research Shows

BioWorma's active strain has been studied in field trials across Australia spanning different climates and seasons, evaluating cattle, goats, horses, and sheep separately. IAHP's published research reports overall average pasture larval count reductions of 84% in horses, 81% in cattle, 86% in goats, and 68% in sheep.

These are averages across multiple trials, not guarantees for any individual operation. Results vary by season, climate, existing pasture contamination, and how consistently the product is fed. None of these studies claim complete elimination of pasture parasites, and BioWorma shouldn't be measured against that bar. What's supported is a substantial, repeatable reduction in reinfection pressure.

Which Animals Can Use BioWorma

BioWorma is labeled for sheep, goats, cattle, and horses, each with their own list of targeted nematode species. In sheep and goats, that includes Barber's Pole Worm, Black Scour Worm, Brown Stomach Worm, Nodule Worm, Thin-necked Intestinal Worm, and Hookworm. Cattle share most of that list plus Intestinal Worm (Cooperia). Horses have a separate set: large and small strongyles, Stomach Hair Worm, Ascarids, Threadworms, and Pinworms. It's also labeled for other grazing animals, including deer, alpacas, and zoo species, and has been studied in exotic ruminant hoofstock like giraffe and antelope in zoo settings.

As with any parasite control product, the right fit depends on the specific worm species present, the season, and existing herd health. BioWorma is meant to be one part of an integrated parasite management program, not a standalone fix.

BioWorma vs. Livamol with BioWorma: What's the Difference

Exotic Animal Supply carries both products, and the difference between them comes down to concentration, form, and added nutrition, not the active ingredient.

Both products deliver the same fungal spores and work the same way once they reach the manure. Livamol with BioWorma carries its own safety classification that BioWorma doesn't, its manufacturer safety data sheet lists it as a skin and eye irritant, meaning basic handling precautions like gloves and eye protection are worth following when working with it directly, even though the fungal spores themselves are considered non-hazardous.

Neither product is more effective than the other at an equivalent spore intake. The choice comes down to feeding format and whether the added nutritional profile is useful for the animals on your operation.

How to Use BioWorma

The manufacturer's directions follow the same sequence regardless of which product you're using. Start by treating animals with a suitable chemical wormer to clear the existing burden. From there, move treated animals onto lower-risk pasture where possible, ideally ground the same species hasn't grazed in at least six weeks. Once that's done, begin daily feeding, mixed thoroughly into feed or feed supplements, dosed according to the product's labeled rate for your animals' bodyweight.

Feeding is most useful during periods when conditions favor larval development, generally when temperatures stay above 40°F, which covers most of the grazing season across much of the country. This is meant to run as an ongoing program rather than a short course. Producers stocking up on other goat, sheep, or cattle husbandry supplies often set this up as part of a standing routine rather than a one-time purchase.

For exact dosing by bodyweight, follow the label directions or the product page for the specific item you're using, since BioWorma and Livamol with BioWorma are dosed at different rates due to their different concentrations. If you're working with goats specifically, our dedicated guide to BioWorma for goats covers species-specific dosing and priority feeding groups in more detail.

Where to Buy BioWorma

Once BioWorma or Livamol is part of an operation's routine, staying consistent through the season matters more than any single dose.

Exotic Animal Supply is one of only two authorized sellers of BioWorma and Livamol with BioWorma in the United States. As the world's largest Mazuri dealer with four climate-controlled warehouses across Texas, Florida, and North Carolina, EAS ships same-day on orders placed before 2 PM EST, so an active parasite program doesn't lose ground waiting on supply.

Frequently Asked Questions

Does BioWorma replace a dewormer?

No. BioWorma controls the parasite population in manure and on pasture. It has no effect on worms already inside the animal. Animals should be treated with a chemical wormer first, then maintained on BioWorma to reduce reinfection going forward.

What's the difference between BioWorma and Livamol with BioWorma?

Both contain the same active ingredient at different concentrations. BioWorma is a concentrated meal mixed into existing feed at a lower volume per animal. Livamol with BioWorma is a premixed, palatable supplement with added protein, fat, and vitamins, fed at a higher volume per animal.

Which animals can use BioWorma?

Sheep, goats, cattle, and horses are all labeled uses, along with other grazing species including deer, alpacas, and zoo animals.

How often should BioWorma be fed?

Daily, as part of an ongoing parasite management program, particularly during periods when pasture conditions favor larval development.

Does BioWorma affect dung beetles or earthworms?

No. The manufacturer's data indicates no negative effects on non-target soil organisms, including earthworms and soil microarthropods.

Is BioWorma a chemical product?

No. It's a biological control using a naturally occurring soil fungus, classified as non-hazardous and non-toxic according to its safety data sheet. Livamol with BioWorma, due to its added mineral and vitamin premix, carries a different safety classification and is handled with standard precautions like gloves and eye protection.