Topics:
Animal Nutrition, Animal Refresher
ATP Production from VFAs (Acetate, Propionate, Butyrate)
Moles of ATP produced by metabolism of 1 mole of acetate, propionate and butyrate are respectively:
- 17, 10, 25
- 10, 16, 24
- 10, 17, 25 — Correct Answer
- 12, 18, 27
Explanation:
Correct Answer: 10, 17, 25
The ATP yield from complete oxidation of VFAs produced in the rumen:
- Acetate (2C): 10 ATPs — enters TCA cycle as Acetyl-CoA after activation
- Propionate (3C): 17 ATPs — most energy-efficient VFA per carbon; converted to succinyl-CoA via the succinate pathway, entering the TCA cycle
- Butyrate (4C): 25 ATPs — converted to 2 molecules of Acetyl-CoA
Comparison with Other Substrates
- Glucose (aerobic): 38 ATPs
- Glycerol: 22 ATPs
- Palmitic acid: 129 ATPs
1 mole ATP on hydrolysis yields:
7.3 kcal of free energy (ΔG = −7.3 kcal/mol)
📚 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.
