Question

Crude protein content (%) in maize is

• A. 10
• B. 9
• C. 8
• D. 11

Hint:

Yellow maize is primarily an energy source, containing approximately 9% crude protein.
Its protein is deficient in the essential amino acids lysine and tryptophan, which must be supplemented using protein concentrates like soybean meal.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Maize (corn) is the most widely used cereal grain in livestock and poultry feeds due to its high energy content, palatability, and digestibility.
However, formulating balanced rations requires knowing its nutrient composition, particularly its protein content.

Step 2: Detailed Explanation:
Let us analyze the chemical composition of yellow dent maize grain:
- Carbohydrates: Maize is highly rich in starch (approx. 70% to 72%), making it an excellent energy source with a high metabolizable energy (ME) value of approximately 3350 kcal/kg.
- Crude Protein (CP): Cereal grains are generally low-to-moderate in protein.
The average crude protein content of yellow maize is 9.0% (ranging typically from 8.5% to 9.5% depending on soil fertility, nitrogen fertilization, and variety).
This matches Option (B).
- Essential Amino Acids: Maize protein (zein) is deficient in key essential amino acids, particularly lysine and tryptophan, which must be supplemented in poultry and swine diets.
- Crude Fiber: It has a low fiber content of approximately 2.0% to 2.5%, making it highly digestible.
- Ether Extract (Fat): Contains approximately 3.5% to 4.5% oil, which contributes to its high energy density.
Therefore, the standard nominal value for crude protein in maize is 9%.

Step 3: Final Answer:
The crude protein content of maize is 9%.