Livestock manure fermentation is the biological process that consumes the readily decomposable fraction of stored manure, so the material stops generating heat, ammonia and odour and is ready to compost without a second souring phase. It is driven by oxygen and moisture in the stored mass, and where a site controls those, a fermentation agent can shorten the stabilisation period and make the compost stage more predictable.
This is written for farm managers, manure contractors and processors who treat manure as a material rather than a waste stream. The question behind most enquiries is rarely whether composting works, but where the odour comes from during storage and what has to change first.
Product referenced in this article
Livestock Manure Fermentation Agent — application notes, specification table and document downloads for this range.
What stabilisation actually means
Stabilisation is an endpoint, not a duration, reached when the readily available fractions have been consumed and what remains no longer drives a strong reaction on being disturbed. You can recognise it without instruments: the pile no longer heats after turning, surface ammonia drops, and the material moves without gas release.
That is what makes it worth doing before composting. Unstabilised material carries its whole reactive fraction into the pile, where it heats rapidly, drives oxygen out of the centre and produces ammonia as well as odour. The core goes anaerobic and later turning cannot reach it. Material that arrives stabilised enters the compost stage cooler and behaves as designed.
Manure that has sat uncovered has partly stabilised and partly soured, and those states are not evenly mixed, so treating it as one material treats the sour fraction as if it were fresh.
Why storage is where the odour is generated
Fresh manure arrives wet, warm and high in readily degradable carbon, carrying the nitrogen that produced it. Laid in a heap and left alone, the interior loses oxygen and the population switches to the anaerobic pathway, where ammonia, hydrogen sulphide and the volatile compounds behind livestock odour form.
Everything that keeps the store anaerobic makes it worse: no drainage, so liquor returns and wets the base; no cover, so rain adds water; no turning, so the crust seals. A store that dries out and compacts can go anaerobic for the opposite reason, with no free water left.
So the first improvements in a storage problem are physical: roof it, drain it to a sealed sump, keep the surface workable, and turn it on a schedule you can keep.
What changes when composting starts properly
Composting is the same aerobic decomposition run faster, with heat removed deliberately. What separates a working compost from a failed heap is control of a few variables at once.
| Variable | What it controls | What goes wrong without it |
|---|---|---|
| Oxygen | Aerobic pathway, temperature | Anaerobic core, ammonia and hydrogen sulphide in the middle |
| Moisture | Microbial movement through the mass | Too dry and it stops; too wet and air is displaced |
| Carbon to nitrogen | Whether nitrogen is held or lost as ammonia | Excess nitrogen volatilises, losing odour and nutrient value |
| Particle structure | Air movement and free drainage | Compaction, sealed crust, pockets that never turn |
| Turning or forced air | Temperature uniformity and re-aeration | Hot and cold zones, ammonia released at each turn |
| Cover | Whether the process is enclosed or exposed | Rainfall wets the surface; no condensate capture |
Read the table as a diagnosis list rather than a specification. When a pile misbehaves it is almost always one of the first three rows, and usually visible without instruments.
Storage under cover before composting
Where the herd is still in the building, a covered store is often the cheapest improvement available. Roofing removes the rainfall that keeps the surface wet, drainage to a sealed sump removes the return flow that drowns the base, and turning keeps an aerobic core. Boundary odour usually falls once these three are in place, before any product is involved.
The trade-off is footprint and handling: material must be moved in and out. Farms already moving cleanout manure once a cycle often find stabilising it where it lies simpler than building storage.
Where a fermentation agent changes the process
An inoculant is a selected population added to the material. It is useful where the native population is slow to establish, the store has selected the wrong flora, or the process must run to a schedule. It is not useful where the problem is physical.
Our livestock manure fermentation agent is selected for the store and compost stage together, since the same population does two jobs in sequence. The mechanism is covered in peer-reviewed work on combined Aspergillus oryzae and Bacillus subtilis inoculants in beef cattle manure composting; a research reference rather than a performance claim.
Application follows the regime rather than the label. Dosage is quoted against your material volume and carbon to nitrogen balance, and the point of application depends on whether you are treating a standing store or building a pile. We are a National High-Tech Enterprise with 10+ granted patents and run our own fermentation pilot plant, so a blend can be reviewed against your data rather than taken from a catalogue.
Windrow, aerated bed or covered vessel
A windrow depends on turning for its air, which makes it cheap to start and sensitive to discipline, because the schedule and machine set how evenly the mass is aerated. A forced-aerated bed or covered vessel pushes air through, giving tighter control of temperature and moisture and collecting condensate, at the cost of equipment and power.
No route is right in the abstract. The question is what handling you have, and whether the site is cold enough in winter that a turning-only system stalls.
From stabilised material to something usable
The point of stabilising first is what comes after. Manure composted to a finished, stable material can be stored, blended, cured and applied with far less loss than manure that has only been stacked, because less ammonia has left it.
Where the material is destined for drying and pelleting, stabilisation matters more still, because those processes are unforgiving of immature input. Where it goes to direct land application under a nutrient management plan, the required processing level is set by that plan and by local rules, which vary between jurisdictions.
Where it sits among the other products
Manure treatment covers the store and pile, not surfaces inside the building. A biological deodorizer for livestock farms addresses wetted, organically loaded surfaces such as slatted areas, the dunging alley and the pit lip. A wet point washed every cycle, such as a drinker line, is usually better served by an enzymatic deodorizer preparation.
Where a house runs bedding that drops through slats, that bedding is a separate application with its own parameters, covered in our note on bacteria culture for fermentation bedding. Specifying one product for both a bed and a store is a common cause of poor results.
Limits and safety
No biological preparation corrects a leaking roof, a store with no drainage, a pile that is never turned, or a carbon to nitrogen balance that volatilises the nitrogen you were retaining. We do not quote a removal rate or a fixed timeline, because both vary more between sites than any product attribute covers; we describe a typical application.
The strains we supply are non-pathogenic environmental organisms selected for organic decomposition. Confirm species, strain composition and viability documentation for your conditions, and request the safety data sheet with your quotation. We are ISO9001, ISO14001 and ISO45001 certified, with a certificate of analysis per batch.
How to judge whether it is working
You can assess this on site. Check four things on the same day each cycle: does the mass heat after turning and settle, or stay cold; is ammonia detectable at the surface; does the material stay workable or has it become a wet mat; does the odour read earthy rather than sharp.
Turn a fresh section and an untouched one and compare. A large difference points to aeration or distribution; identical and wrong in both points to the material or the regime, not the population.
What to send us for a specification
Send the livestock type and numbers, the manure system and material type, the storage period and cover, the composting route, the turning or aeration available, the volume, your climate temperature range, the problem and the quantity required. We reply with the strain selection, application regime, dosage by location and an indicative price.
Frequently asked questions
- What does stabilisation mean for stored livestock manure?
- Stabilisation is the point at which the readily decomposable fraction of the manure has been consumed and the remaining organic matter no longer generates heat, ammonia or odour on handling. It is a biological endpoint rather than a number of days, judged by temperature behaviour, surface ammonia and how the material handles. Stabilised manure can be composted without a second peak of anaerobic activity, whereas unstabilised material loaded into a pile will go sour and generate ammonia inside the mass.
- Should manure be stabilised before composting, or can it be composted directly?
- Both routes are used, and the right answer depends on how the material arrives. Fresh manure loaded directly into a well-aerated windrow or covered vessel can compost in place, treated as one system. Manure that has already sat in an uncovered store has partly stabilised and partly soured, so the pile starts with an anaerobic core that has to be worked out before the aerobic phase can be relied on. Storing under cover and stabilising deliberately gives more control, lower ammonia loss and a shorter overall cycle, at the cost of holding area.
- Does a fermentation agent replace turning, aeration or covering?
- No. An inoculant works on the material it is mixed into and needs oxygen, moisture and a workable carbon to nitrogen balance to express itself. It cannot substitute for turning, for aeration forced into a covered pile, or for drainage and cover on the store. Where the base rate of those things is wrong, the inoculant performs badly and the diagnosis usually returns to management rather than to the product. Specify the product against a regime you are actually able to run.
- How is a windrow different from an aerated or covered system?
- A windrow depends on turning to bring outside air into the mass, so the schedule and the turning equipment determine how evenly it aerates. A forced-aerated bed or a covered vessel pushes air through, which gives tighter control of temperature and moisture but costs equipment and power, and lets condensate be handled rather than leaking. There is no universally better route; the practical question is what handling you have available and whether the material must stay workable for a downstream process.
- Can manure stabilisation replace a deodorizer for the surrounding site?
- No. Treating the manure addresses the store and the compost process. It does not treat the wet, frequently washed surfaces inside the building, a leaking water line, an open slurry channel or the exhaust air drawn from the animal house, all of which generate odour continuously and independently of the store. Sites that need both usually run separate products suited to each environment rather than expecting one preparation to cover a wet surface and a stored organic solid.
- What should I send you to receive a specification and quotation?
- Send the livestock type and numbers, the manure system and whether the material is slurry, alley cleanout or a mixed store, the storage period and how it is covered, the composting route and the turning or aeration available, the volume involved, your climate temperature range, the problem you are trying to solve, and the quantity required. Our technical team replies with the strain selection, application regime, dosage by location and pricing.