How to read a soybean meal certificate of analysis
Soybean meal is the reference protein in least cost formulation, which means every other protein source gets priced against it. That makes the certificate of analysis worth more than a glance.
Crude protein is necessary but not sufficient
A 46% crude protein guarantee tells you how much nitrogen is present. It does not tell you how much of that protein the bird or the pig can actually use. Two lots at the same crude protein can perform very differently, and the difference usually comes down to processing.
Urease activity, the toasting indicator
Raw soybeans contain trypsin inhibitors that must be destroyed by heat. Urease activity is the proxy for whether that heating was done correctly, and the accepted window sits roughly between 0.02 and 0.30.
Above that range, the meal is under toasted. Trypsin inhibitors survive, protein digestion is impaired, and performance drops even though the crude protein figure looks fine.
Below that range, the meal has been over toasted. This is the more dangerous case, because crude protein still analyses well while available lysine has been damaged by the Maillard reaction. The certificate looks good and the birds do not grow.
Ask for lysine, not just protein
Typical lysine in 46% meal runs 2.8 to 3.0%. If a supplier can give you lysine alongside crude protein and urease, you are dealing with someone who tests properly. If they can only give you crude protein, you are being quoted from a general specification sheet rather than a real analysis.
Three questions worth asking every time
- Is this certificate for the lot being loaded, or a general product specification
- What was the urease activity
- What is the available lysine, not just the crude protein
Related reading
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Tell us the product, the tonnage and the port
Send those three things and we come back with a delivered price, a full specification and a recent certificate of analysis. Usually the same working day.