Topics:
Animal Physiology, Animal Refresher
Diet Enhancing Propionate Production in Ruminants
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Question (English)
In ruminants, propionate production can be enhanced by feeding a:
- High grain (concentrate) diet ✓ Correct
- High roughage diet
- High protein diet
- High fat diet
Explanation:
Correct Answer: High grain (concentrate) diet
High grain (concentrate) diet enhances propionate production in the rumen. Propionate is gluconeogenic and is the main precursor for milk sugar (lactose) synthesis, thereby increasing milk yield.
Diet → VFA → Milk Production Relationship
| Diet | VFA Produced | Effect on Milk |
|---|---|---|
| High roughage/forage | ↑ Acetate | ↑ Milk fat % (high fat milk) |
| High grain/concentrate | ↑ Propionate | ↑ Milk yield (more milk volume) ✔ |
Individual VFA Roles
- Acetate → Milk fat synthesis (C4 onwards fatty acids)
- Propionate → Gluconeogenesis → Milk sugar (lactose) synthesis → Higher milk yield
- Butyrate → Converted to β-hydroxybutyrate by ruminal epithelium (ketone body)
Clinical Relevance
Dairy cows fed high grain diets produce more milk but may have lower milk fat% (milk fat depression). This is due to reduced acetate:propionate ratio.
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
