Discussion
Consider the following statements about oilseed cake:
1. It is concentrated in protein once the oil is removed.
2. Some cakes carry antinutritional factors needing treatment.
3. Over-treatment of the cake improves the protein quality.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statement 1 is correct: removing the oil concentrates everything else, so cake typically runs to 40 per cent protein or more. Statement 2 is correct: several cakes carry antinutritional factors - gossypol in cottonseed, glucosinolates in rapeseed - that must be removed or bound.
Statement 3 is false, and inverts the effect. Over-treatment damages protein quality: excessive heat causes the Maillard reaction, which ties up lysine and reduces digestibility. The treatment must be sufficient but no more.
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