What is the mechanism of frothy bloat?

• A. Gas trapped in stable foam (mixed with rumen contents)
• B. Failure of eructation
• C. Gas production from fermentation
• D. Abomasal volvulus

Answer: (A)

Frothy bloat happens when ruminal gas gets incorporated into a stable foam that forms at the surface of the rumen. This foam coats the feed and creates a viscous layer with high surface tension, so the gas bubbles cannot coalesce and rise to be eructated. Because the foam is resistant to breakdown, the gas remains trapped, causing rapid rumen distension and the characteristic signs of bloat. While gas production from fermentation is ongoing, the key factor in frothy bloat is the stable foam that blocks gas escape, not just a simple failure of eructation or a different disease process like abomasal volvulus.