Executive Summary
Recommended total manganese depends on species. Most livestock diets fall between 20 and 120 mg/kg. MnO 60% contains 465 g of elemental Mn per kilogram, and manganous oxide is the default source in premixes, complete feeds, and mineral mixes worldwide.
Quick Answer: Recommended Mn Levels and the MnO Conversion in One Table
| Species | NRC basal requirement | Typical commercial total Mn | MnO 60% per tonne (supplemental) |
|---|---|---|---|
| Broiler | ~60 mg/kg | 80–120 mg/kg | 0.13–0.26 kg |
| Layer | ~20–30 mg/kg | 60–100 mg/kg | 0.09–0.22 kg |
| Swine (grow-finish) | ~2–4 mg/kg | 20–40 mg/kg | 0.03–0.09 kg |
| Beef cattle | ~20 mg/kg DM | 40–60 mg/kg DM | 0.03–0.08 kg DM |
| Dairy cow | ~13–14 mg/kg DM | 40–60 mg/kg DM | 0.03–0.08 kg DM |
| Sheep | ~20 mg/kg DM | 40–60 mg/kg DM | 0.03–0.08 kg DM |
| Fish | ~10–20 mg/kg | 10–50 mg/kg | 0.02–0.11 kg |
Basal ingredients supply part of this. Feed Grade Manganese Oxide (MnO) 60% covers the remainder at 46.5% elemental Mn (MnO% × 0.774).
What “Recommended Manganese Level” Actually Means: Total Mn vs. Supplemental Mn
Two numbers circulate in specifications. Confusing them causes dosing errors.
| Term | Definition | Who uses it |
|---|---|---|
| Total Mn | Everything in the finished feed — basal + supplemental | Feed mills, lab verification, regulators |
| Supplemental Mn | Only what the premix or mineral mix adds | Premix formulators, nutritionists |
Corn supplies 5–8 mg Mn/kg. Soybean meal 25–35 mg/kg. Forages 20–200+ mg/kg. This basal contribution is variable and poorly absorbed.
A layer diet targeting 80 mg/kg total with 15 mg/kg basal needs 65 mg/kg supplemental. Dosing the full 80 on top of basal Mn wastes material and pushes toward antagonism territory.
Recommended Manganese Levels by Species: Poultry, Swine, Cattle, Sheep, and Fish
| Species | NRC basal requirement | Typical commercial total Mn |
|---|---|---|
| Broiler starter | ~60 mg/kg | 80–120 mg/kg |
| Broiler grower/finisher | ~60 mg/kg | 60–100 mg/kg |
| Layer in lay | ~20–30 mg/kg | 60–100 mg/kg |
| Breeder hen | ~60 mg/kg | 80–120 mg/kg |
| Nursery / grower pig | ~2–4 mg/kg | 20–30 mg/kg |
| Finisher pig | ~2–4 mg/kg | 20 mg/kg |
| Gestating / lactating sow | ~20 mg/kg | 30–40 mg/kg |
| Beef cow / feedlot | ~20 mg/kg DM | 40–60 mg/kg DM |
| Lactating dairy cow | ~13–14 mg/kg DM | 40–60 mg/kg DM |
| Sheep | ~20 mg/kg DM | 40–60 mg/kg DM |
| Shrimp / fish | ~10–20 mg/kg | 10–50 mg/kg |
Species notes:
- Poultry run highest. Perosis, eggshell quality, and embryo development are Mn-sensitive. See our guide on MnO in poultry feed and premixes.
- Swine run lowest. Skeleton, hoof integrity, and sow reproduction drive the margin. See our guide on MnO in swine nutrition.
- Cattle and sheep sit mid-range, pushed up by forage variability and Ca/Fe antagonists. See our guide on MnO in cattle and ruminant feed.
- Aquaculture targets vary with water exposure — leaching losses justify soluble or fine-grade sources.
Why Commercial Levels Run Higher Than NRC Requirements: Safety Margins and Antagonists
| Factor | Effect on Mn requirement |
|---|---|
| High calcium | Reduces Mn absorption |
| High iron | Competes at absorption sites |
| Phytate | Binds Mn, lowers availability |
| Ingredient variation | Basal Mn swings by season and origin |
| Processing losses | Small but real in pelleting and storage |
NRC values prevent deficiency under controlled conditions. Commercial formulas add margin because lameness, poor shells, and silent heats cost far more than the Mn. Genetics companies publish their own guides, which typically exceed NRC.
Upper Safe Limits: How Much Manganese Is Too Much
| Species | Approximate max tolerable Mn |
|---|---|
| Swine | ~400 mg/kg |
| Poultry | ~2,000 mg/kg |
| Cattle | ~1,000 mg/kg |
| Sheep | ~1,000 mg/kg |
Excess Mn suppresses feed intake and competes with iron. In practice, gram-level dosing errors move inclusions by mg/kg, not hundreds — the real risks are antagonism and wasted spend, not toxicity.
For buyers, the COA’s bounds matter: “Mn 46–47%” means the batch lands where the formula expects. Wide or one-sided specs signal process control problems.
How MnO 60% Supplies the Target: Mn Content and the 0.774 Conversion
Manganese is 77.4% of MnO by molecular weight (54.94 ÷ 70.94).
| Source | Elemental Mn |
|---|---|
| MnO 60% | ≥ 46–47% |
| MnCO₃ | 43–44.5% |
| MnSO₄·H₂O | ~31.8% |
At 46.5% Mn, manganous oxide packs the highest nutrient density of the common inorganic sources. Full conversion background: see How Much Elemental Manganese Is in 60% Manganese Oxide (MnO)?
Dosage Math: Converting Your Target Mn Level into kg of MnO per Tonne
Universal formula:
kg MnO 60% per tonne = supplemental Mn (mg/kg) ÷ 465
Because 1 kg MnO 60% = 465 g elemental Mn.
Worked examples:
| Scenario | Supplemental Mn target | MnO 60% per tonne |
|---|---|---|
| Broiler, 100 mg/kg total, 20 basal | 80 mg/kg | 80 ÷ 0.465 = 172 g ≈ 0.17 kg |
| Sow, 40 mg/kg total, 15 basal | 25 mg/kg | 25 ÷ 0.465 = 54 g ≈ 0.05 kg |
| Dairy TMR, 50 mg/kg DM total, 25 basal | 25 mg/kg | 25 ÷ 0.465 = 54 g ≈ 0.05 kg DM |
Reverse check — from label to diet:
A premix dosed at 5 kg/tonne containing 3.4% MnO 60% delivers: 5 kg × 0.034 × 0.465 = 79 g Mn per tonne ≈ 79 mg/kg. Verify the chain, not just the label.
At these inclusions, weighing precision matters. Pre-blend through the premix; never direct-dose gram-level additions.
How MnO Compares with Other Sources in Meeting Mn Requirements
| Factor | MnO 60% | MnSO₄·H₂O | MnCO₃ | Organic Mn |
|---|---|---|---|---|
| Mn density | Highest | Low | Mid | Very low |
| Bioavailability | 70–100% | 100% (ref.) | Low–moderate | 100–130% |
| Cost per kg Mn | Lowest | Medium | Medium | Highest |
| Process fit | Premix, TMR, blocks | Liquid, aquatic | Low-reactivity needs | Critical groups |
Decision rule: match the source to the formula and delivery vehicle, then buy on price per kg of elemental Mn. Full comparison: see What Is the Difference Between Manganese Oxide, Manganese Sulfate, and Other Manganese Sources for Animal Feed?
Verifying Your Mn Source Delivers: COA and Formulation Checks
| COA line | What to check |
|---|---|
| MnO % | Matches or exceeds grade claim |
| Mn % | 46–47% for 60% MnO; consistent with MnO × 0.774 |
| Heavy metals | As ≤ 5 ppm, Pb ≤ 10 ppm, Cd ≤ 5 ppm |
| Citric acid solubility | ≥ 85–90% for availability |
| Moisture | ≤ 1.5% for flow and storage |
| Test method | ICP-OES, AAS, or titration stated |
Formulation checks:
- Confirm assay basis: as-received or dry.
- Confirm scale precision suits the inclusion rate — micro-ingredient lines for gram-level dosing.
- Confirm premix dilution stage before the main mixer.
Batch-to-batch consistency across shipments separates reliable suppliers from spot traders. Third-party SGS or Intertek verification is available on request.
Frequently Asked Questions About Manganese Levels in Animal Feed
What Mn level should broiler feed have?
Total 80–120 mg/kg in commercial practice against an NRC basal need of ~60 mg/kg. Breed-line guides set the working number.
Is 40 ppm enough for dairy cows?
Yes, as a total floor. Most dairy programs run 40–60 mg/kg DM to cover antagonists, forage variability, and reproduction pressure.
How much MnO 60% equals 100 g Mn per tonne?
100 g ÷ 0.465 = 215 g ≈ 0.22 kg of MnO 60% per tonne.
Do all species need the same Mn?
No. Poultry need the most (60–120 mg/kg). Swine the least (20–40 mg/kg). Ruminants sit mid-range (40–60 mg/kg DM) because antagonists, not basal need, drive the margin.
Total or supplemental — which number goes on my spec?
Total on the finished-feed spec. Supplemental on the premix spec. State the basis explicitly to avoid double-counting basal Mn.
Conclusion: Set the Level First, Then Let MnO Deliver It
Start with the species target: 20–40 mg/kg for swine, 40–60 for ruminants, 60–120 for poultry. Subtract basal Mn. Convert the remainder with the 0.774 factor — supplemental Mn ÷ 0.465 gives kg of MnO 60% per tonne. Verify the COA before the shipment clears.
We supply feed-grade manganous oxide sized to your species and feed line — powder for premixes, mineral-mix and block grades for ruminant programs. Tell us your target Mn level. We’ll confirm the spec, TDS, and COA, and send a sample.
I am Edward lee, founder of manganesesupply( btlnewmaterial) , with more than 15 years experience in manganese products R&D and international sales, I helped more than 50+ corporates and am devoted to providing solutions to clients business.
