Topics: Animal Nutrition, Animal Refresher

Estimation Factors for Protein and Energy

Match the estimation factor with its corresponding nutrient or feed component:

Column A	Column B
1. Protein estimation of milk	(a) 1.25
2. Protein estimation of feed stuff	(b) 2.25
3. Energy estimation (TDN) of fat	(c) 6.25
4. Gross energy correction of protein	(d) 5.30
5. Protein estimation of cotton seed	(e) 6.38

1-e, 2-c, 3-b, 4-a, 5-d
1-c, 2-e, 3-b, 4-a, 5-d
1-e, 2-d, 3-b, 4-c, 5-a
1-d, 2-c, 3-b, 4-a, 5-e

Estimation Factors for Protein and Energy

Match the estimation factor with its corresponding nutrient or feed component:

Column A	Column B
1. Protein estimation of milk	(a) 1.25
2. Protein estimation of feed stuff	(b) 2.25
3. Energy estimation (TDN) of fat	(c) 6.25
4. Gross energy correction of protein	(d) 5.30
5. Protein estimation of cotton seed	(e) 6.38

Options

1-e, 2-c, 3-b, 4-a, 5-d ✓
1-c, 2-e, 3-b, 4-a, 5-d
1-e, 2-d, 3-b, 4-c, 5-a
1-d, 2-c, 3-b, 4-a, 5-e

Correct Answer: A

Explanation in English

Correct Answer: 1-e, 2-c, 3-b, 4-a, 5-d

Multiplication factors used in nutritional analysis:

Protein of milk → 6.38 (e): Milk protein contains 15.67% N, so factor = 100/15.67 = 6.38. (Different from general 6.25 because casein has different N content.)
Protein of feedstuffs → 6.25 (c): Standard CP factor. Assumes all protein contains 16% N. Factor = 100/16 = 6.25. (CP = N% × 6.25)
TDN energy estimation of fat → 2.25 (b): Fat has 2.25 times more energy than carbohydrate. Used in TDN formula: TDN = DCP + DCF + DNFE + (DEE × 2.25).
Gross energy of protein → 1.25 (a): Urinary energy correction for protein = 1.25 kcal/g (deducted from protein GE of 5.65 to get PFV of 4.4 kcal/g).
Protein of cottonseed → 5.30 (d): Cottonseed proteins contain higher N (approximately 18.9% N), so the factor = 100/18.9 ≈ 5.30.

📚 About this Topic — Animal Nutrition

This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.

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