What is DORB (De-Oiled Rice Bran)?
De-Oiled Rice Bran (DORB) is the by-product left after rice bran oil is extracted from rice bran (the outer layer of the rice grain).
Once the oil is removed, the leftover material — DORB — is rich in protein, fiber, and essential nutrients, but low in fat.
How is DORB Produced?
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Rice Milling: Rice is milled to remove the husk and bran.
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Rice Bran Extraction: The oil is extracted from the rice bran, usually through a solvent extraction process (using hexane or mechanical methods).
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De-Oiled Product: The material that remains after oil removal is called De-Oiled Rice Bran.
Composition of DORB
| Component | Typical Value (%) |
|---|---|
| Crude Protein | 16–18% |
| Crude Fiber | 11–14% |
| Ash (Minerals) | 10–12% |
| Fat | 1–2% (very low) |
| Nitrogen-Free Extract (NFE) | 50–55% |
| Moisture | 10–12% |
(Exact composition can vary depending on the rice variety and processing method.)
Uses of DORB
| Use | Details |
|---|---|
| Animal Feed | A major ingredient in cattle, poultry, fish, and pig feed. It provides energy and protein. |
| Organic Fertilizer | Used in making organic compost and fertilizers because of its nutrient richness. |
| Industrial Applications | Used in biofuel, bioplastics, and enzyme production industries. |
| Aquaculture | Important component in fish feed for its balanced nutrient profile. |
Advantages of DORB
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Cost-Effective: It’s cheaper than soybean meal or maize.
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Sustainable: It utilizes by-products from rice processing, reducing waste.
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Nutrient-Rich: Good balance of protein, fiber, and minerals.
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Digestibility: Improved with proper processing (like pelleting or enzyme treatment).
Limitations/Challenges
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High Fiber Content: May reduce digestibility for some animals (especially poultry) unless treated.
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Lower Protein Quality: Compared to soybean meal or fish meal.
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Anti-Nutritional Factors: Phytates and silica can reduce mineral absorption unless treated.
Grades/Types of DORB
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Grade-I: Higher protein (>16%) and lower fiber.
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Grade-II: Slightly lower quality (protein around 14%).
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Special Treated DORB: Enzyme-treated or fortified for better digestibility.
DORB in Global Trade
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India is one of the largest producers and exporters of De-Oiled Rice Bran.
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Major importing countries: Vietnam, Bangladesh, Middle East nations, etc.
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