Overview
Soybean Meal is the world's most widely used protein source in poultry feed, primarily due to its exceptional amino acid profile and high digestibility. It serves as the nutritional 'gold standard' for vegetable proteins in broiler and layer diets.
Nutritional Profile
| crudeProtein | 44–48.5% (depending on whether hulls are removed during processing) |
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| aminoAcidBalance | Exceptionally rich in lysine (crucial for muscle growth), threonine, and tryptophan |
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| limitingAminoAcids | Naturally low in sulfur amino acids — methionine and cysteine. Diets are almost always supplemented with synthetic methionine to balance. |
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| metabolizableEnergy | Approximately 2,200–2,500 kcal/kg |
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Anti-Nutritional Factors
- Trypsin inhibitors — block protein-digesting enzymes; cause poor growth and pancreatic issues. Neutralised by proper toasting.
- Oligosaccharides (raffinose, stachyose) — indigestible for poultry; cause digestive upset or wet litter.
- Phytate — binds phosphorus and other minerals; broken down by added phytase enzymes.
Recommended Inclusion Rates
| Broilers | 25%–40% of total diet |
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| Layers | 20%–25% (supports egg weight & production) |
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| Coverage | Typically 80% of total dietary amino acids in corn-soy formulations |
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Comparison: vs Corn Gluten Meal (CGM)
| Protein Content | SBM 44–48.5% · CGM 60–70% |
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| Lysine Level | SBM high (strong growth) · CGM low (must supplement) |
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| Methionine Level | SBM low · CGM high (good for feathers) |
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| Main Use | SBM primary protein base · CGM pigmentation & density |
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