What the number actually represents
Kjeldahl and Dumas both measure nitrogen, then assume protein is 16% nitrogen. Non-protein nitrogen — urea, ammonium salts, adulterants — is counted as protein. That is why crude protein alone is never a sufficient acceptance criterion for a protein meal.
As-fed versus dry-matter basis
A 46% CP meal at 12% moisture and a 46% CP meal at 10% moisture are not the same purchase. Always confirm whether the contract basis is as-fed or dry matter, and state the moisture reference in the specification so protein is comparable between origins.
Why formulators look past crude protein
Least-cost formulation works on digestible amino acids, not crude protein. Two meals with identical CP can differ by several percentage points in digestible lysine after heat damage. Pair CP with reactive lysine, KOH solubility or urease activity where the process risk exists.
Typical industrial reference values
| Soybean meal | 44–48% CP | Dehulled grades sit at the upper end |
| Sunflower meal | 28–38% CP | Driven by dehulling degree |
| Fish meal | 60–72% CP | Species and pressing route dependent |
| Corn / maize | 7–9% CP | Energy ingredient, not a protein source |
Indicative industry reference values for orientation only — always contract against the delivered lot.
What to verify
- —Method stated on the certificate of analysis (Kjeldahl or Dumas) and the nitrogen factor used
- —Moisture basis for the declared protein value
- —Protein tolerance and price-adjustment clause in the contract
- —Independent verification on a representative composite sample at discharge
Typical risks
- —Non-protein nitrogen adulteration inflating apparent protein
- —Heat damage reducing digestible lysine while crude protein stays unchanged
- —Protein declared on a different moisture basis than the contract assumes
Common mistakes
- —Buying on crude protein alone without an amino-acid or digestibility clause
- —Ignoring the sampling plan behind the certificate of analysis
- —Accepting a protein claim without a defined analytical tolerance
Frequently asked questions
Is a higher crude protein always better?
No. Higher crude protein raises cost and can raise fibre or anti-nutritional load depending on the process route. Value comes from digestible amino acids per unit of cost, not from the crude protein headline.
How much analytical variation is normal?
Laboratory reproducibility for crude protein is typically around ±0.5 to ±1.0 percentage points between labs. Contracts usually define a tolerance band and an umpire laboratory for disputes.
Where this matters most
Related topics
The amino-acid profile — and above all digestible lysine, methionine, threonine and tryptophan — is what protein ingredients are actually bought for in modern formulation.
Moisture is water content expressed as a percentage; it dilutes every other nutrient, drives mould and mycotoxin risk in storage, and is the single most disputed parameter in bulk feed trade.
Digestibility expresses the proportion of a nutrient the animal can actually absorb; it converts an analytical composition into a nutritional value.
A certificate of analysis is a lot-specific record of tested parameters, methods and results; a generic or typical-values sheet is a marketing document, not a certificate.
Build a structured RFQ with the parameters, tolerances and verification steps written in — free for buyers.
Start your RFQFor commercial farm feed buyers
Buying feed specified on crude protein for a commercial farm
- Best for
- Commercial farms, integrators, distributors and feed buyers sourcing feed specified on crude protein and related feed, additives or nutrition supply on a recurring commercial scale — not pet food, hobby farms or backyard quantities.
- Animal species covered
- Broilers and layers, dairy and beef cattle, pigs, tilapia, salmon and shrimp, plus sheep and goats on request.
- Typical feed buyer needs
- A written specification, verified suppliers who can hold that specification, comparable pricing on the same delivery terms, documented quality (CoA, certifications) and a supply schedule that matches production.
- Bulk feed and recurring supply
- Most requests are bulk or big-bag volumes on monthly or quarterly contracts. Volume per delivery, storage capacity on farm and contract length change price more than the headline per-tonne quote.
- Feed additives and premix
- Premix, amino acids, minerals, vitamins, enzymes, organic acids, toxin binders and other additives can be quoted alongside compound feed or ingredients so one supplier comparison covers the whole ration.
- What affects feed cost
- Raw-material origin and specification, inclusion rates, freight and Incoterms, packaging, order volume, payment terms, currency and certification requirements. Landed cost, not ex-works price, decides the winner.
- RFQ checklist
- Species and production stage, tonnes per month, target specification, delivery port or farm location, packaging, required certifications, first delivery date and contract duration.
- Supplier matching process
- You define the requirement, FeedMatch structures the RFQ, sends it to relevant qualified suppliers, and returns comparable offers side by side so you can negotiate on equal terms.
- Buyer is not charged
- Farm buyers are not charged to submit a requirement, receive matched suppliers or compare quotes.
FeedMatch helps farm buyers compare feed suppliers, nutrition providers, additives suppliers and related solutions. FeedMatch is an intermediary and does not manufacture feed or provide financing directly.
Technical parameter names and analytical method references are kept in English because they are quoted verbatim in contracts, certificates and international standards.
Educational reference. FeedMatch Group does not rank, recommend or endorse manufacturers.
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