Topics:
Animal Nutrition, Animal Refresher
VFA with Maximum Absorption Rate
VFA having maximum absorption rate is:
- Acetate
- Propionate
- Butyrate — Correct Answer
- None
Explanation:
Correct Answer: Butyrate
Among the three major volatile fatty acids, Butyrate (Butyric acid) has the maximum rate of absorption through the rumen wall. Its shorter chain and higher lipophilicity allow it to be taken up most rapidly by ruminal epithelial cells.
VFA Absorption — Key Facts
| VFA | Rumen Proportion | Absorption Rate | Primary Use |
|---|---|---|---|
| Acetate | 65% | Moderate | Milk fat synthesis |
| Propionate | 20% | Moderate | Gluconeogenesis → milk sugar |
| Butyrate | 10% | Maximum | Converted to β-hydroxy butyrate (ketone body) by ruminal epithelial cells |
Additional VFA Notes
- VFAs provide 70% of ruminant energy needs
- Absorption occurs through the rumen wall by passive diffusion (along pH gradient)
- Butyrate also serves as the primary energy source for ruminal epithelial cells
Why Other Options Are Wrong
- Acetate → highest quantity produced but not highest absorption rate
- Propionate → gluconeogenic; absorbed at moderate rate; converted to glucose in liver
- None → incorrect; Butyrate's maximum absorption rate is a well-established rumen physiology fact
📚 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.
