↗ public sourceswww.addcon.com/en/feed/silage-additives/chemical-additives/kofasil-ultra· 3 studies, 3 independent/mixed
Evidence · moderate
The active substance is backed by 3 studies including meta-analyses; the verdict per claim below reflects what the literature actually shows, not the brochure. Strength reflects the active substance, not the brand.
What the manufacturer claims
Free
Captured from the product page, typed and attributed — the producer’s own statements, checked against the literature below.
Safety
Prevents Clostridia (butyric fermentation, botulism risk), Listeria and E. coli in silage
Stability
Prevents yeasts and moulds (aerobic deterioration), improving aerobic stability — effective at both high and low dry matter
Physiological
Produces hygienically impeccable silage that cattle and horses accept well
Manufacturer’s own words — not independently verified. The ledger below gives the evidence verdict for each.
Claim ↔ evidence ledger
Verdict free · receipts in Power
Each claim against the studies on the active substance, with the funding split. Open a row for the studies behind the verdict.
Claim
Verdict
Evidence & funding
SafetyPrevents Clostridia (butyric fermentation, botulism risk), Listeria and E. coli in s…
Mixed
2 studies · 100% indep
›
Read Clostridia/butyric-acid control by the nitrite chemistry is supported; the hexamine co-agent's added value is doubtful.
2009
Ensiling of high-wilted grass-clover by different additives (incl. Kofasil Ultra) to improve qualityKofasil Ultra and nitrite/benzoate mixtures reduced butyric acid and ammonia-N (P<0.001) and improved aerobic stability vs untreated
Impact of hexamine addition to a nitrite-based additive on fermentation, Clostridia and yeasts in white lupin-wheat silageAdding hexamine to sodium nitrite did not improve silage quality vs nitrite alone; more hexamine raised pH and lowered lactic acid
PhysiologicalProduces hygienically impeccable silage that cattle and horses accept well
Not addressed
no study
›
Palatability/acceptance was not measured in the captured studies.
IndependentMixedIndustryNone/undisclosed
Bottom line. Kofasil Ultra's 'dual action' is well grounded: sodium nitrite (with hexamine) targets clostridia and Listeria, while sodium benzoate and propionate improve aerobic stability against yeasts and moulds.
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Composition
Free
● Disclosed by manufacturer
active ingredients — sodium nitrite + hexamine + sodium benzoate + sodium propionateclostridia/Listeria control (nitrite/hexamine) and yeast/mould control (benzoate/propionate)
◆ Referenced — with resolving source
None referenced with a resolving source yet.
Evidence — on the active substance
Table free · full-text in Power
Why these studies The evidence for a proprietary product is the evidence for its active substance. These are the studies (meta-analyses first) behind the verdicts above, with funding labelled.
Year
Study & effect size
Funding
Type
Access
2009
Ensiling of high-wilted grass-clover by different additives (incl. Kofasil Ultra) to improve qualityKofasil Ultra and nitrite/benzoate mixtures reduced butyric acid and ammonia-N (P<0.001) and improved aerobic stability vs untreated
Impact of hexamine addition to a nitrite-based additive on fermentation, Clostridia and yeasts in white lupin-wheat silageAdding hexamine to sodium nitrite did not improve silage quality vs nitrite alone; more hexamine raised pH and lowered lactic acid
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Analysis & tools
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The working map a maker won’t give you — built only from the evidence on this page. Nothing here is marketing.
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Open the analyst workbench
Dose benchmark, the independent-vs-sponsored split, the pooled meta-analysis effects, the contradictions and the gaps — all derived from the studies above.
Dose: label vs effective trial range vs EU max
Independence-of-evidence breakdown
Pooled meta-analysis effect sizes
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Dose benchmark
Label / recommended~2 L per bale (undiluted)
Effective in trials~900 g sodium nitrite per tonne forage in trials
EU maximumPer-component limits apply (sodium nitrite maximum content + a waiting period before feeding)
Kofasil Ultra's 'dual action' is well grounded: sodium nitrite (with hexamine) targets clostridia and Listeria, while sodium benzoate and propionate improve aerobic stability against yeasts and moulds.
Independent silage trials confirm reduced butyric acid and ammonia-N and improved aerobic stability for this chemistry.
An honest caveat: an independent study found the hexamine component added no benefit over sodium nitrite alone, and raising hexamine even worsened fermentation.
Regulatory use conditions matter — sodium nitrite carries a maximum content and a minimum interval before the silage can be fed.
It is a chemical (not biological) additive, which the maker positions as more reliable for high-dry-matter bales where biologicals can fall short.
Where studies disagree: Independent work shows the sodium nitrite chemistry controls clostridia and the benzoate/propionate chemistry controls yeasts/moulds — but adding hexamine gives no measurable benefit over nitrite alone, despite being part of the blend.
Gaps: No meta-analysis specific to Kofasil Ultra. Palatability and the per-component EU use conditions (nitrite maximum, waiting period) are not detailed on the page.
Manufacturer’s stated mechanism (their words): Sodium nitrite (with hexamine) suppresses Clostridia, Listeria and enterobacteria in the early fermentation, allowing efficient lactic-acid fermentation, while sodium benzoate and propionate inhibit yeasts and moulds to improve aerobic stability on feed-out — a 'dual action' against both wet (clostridial) and dry (mould) spoilage.
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Put this beside alternatives on the same active substance (e.g. HMBi / other rumen-protected methionine), and take the data with you.
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