Eructation – What is Eliminated from Rumen

Eructation is the elimination of __________ from the rumen.

Correct Answer: Rumen gases

Eructation is the process of elimination of rumen gases from the digestive tract through the mouth. It is also known as belching or burping.

Rumen Gas Profile

• CO₂ : CH₄ = 65 : 35 (ratio of carbon dioxide to methane)
• A cow produces approximately 400-600 litres of rumen gas per day.
• Failure of eructation → Bloat (Tympany) — accumulation of gas in rumen, which can be life-threatening.

Types of Bloat

• Free gas bloat: Gas accumulates in a free layer above the rumen contents. Treated by passing a stomach tube.
• Frothy bloat: Gas trapped in foam (common with lush legume pastures). Treated with anti-foaming agents (e.g., poloxalene, simethicone).

Rumen Ecosystem Key Facts

• Normal rumen pH: 6.5–6.8
• Optimum temperature: 39°C
• VFA ratio: Acetate:Propionate:Butyrate = 65:20:10