Question

Secondary ruminal tympany is seen in:

• A. Esophageal obstruction
• B. Consumption of excess leguminous forage
• C. Consumption of excess grain diet
• D. Intestinal obstruction

Hint:

- Primary bloat = Frothy bloat (dietary causes like clover, pasture, or grains).
- Secondary bloat = Free-gas bloat (mechanical or functional blocks to eructation, like esophageal "choke" or vagus indigestion).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Ruminal tympany (bloat) is classified into primary and secondary bloat based on its pathogenesis:
- Primary tympany (Frothy bloat): Physical entrapment of fermentation gases in a stable foam, preventing them from coalescing.
- Secondary tympany (Free-gas bloat): Physical or functional interference with the normal eructation of free gas.

Step 2: Detailed Explanation:
Let us categorize the options based on these physiological definitions:
- Esophageal obstruction (Choke): A physical blockage in the esophagus (by a turnip, potato, or apple) prevents the animal from belching (eructation).
Free gas produced by normal microbial fermentation accumulates rapidly in the rumen, causing severe secondary ruminal tympany.
- Consumption of excess leguminous forage: Alfalfa or clover contains soluble proteins that lead to stable foam production, causing primary frothy bloat.
- Consumption of excess grain diet: A high-carbohydrate grain diet leads to rapid fermentation, acid production, mucilage release by rumen microbes, and stable foam creation, causing primary bloat.
- Intestinal obstruction: This primarily causes posterior abdominal distension, colic, and ileus, rather than acute secondary free-gas bloat due to eructation failure.

Step 3: Final Answer:
Therefore, secondary ruminal tympany is caused by esophageal obstruction.