Forestomachs Diseases Practice Test 2026 – Complete Exam Preparation Resource

Free gas bloat happens because gas produced by rumen fermentation cannot be expelled through eructation. Eructation relies on coordinated rumen contractions and a clear esophageal passage to belch gas upward; when this belching fails, gas accumulates in the rumen, causing distension and respiratory distress. This distinguishes it from frothy bloat, where gas is trapped in stable foam and cannot be released despite normal eructation. Esophageal obstruction can cause belching failure in some cases, but the general mechanism is the inability to eructate gas, not a foam blockage; abomasal displacement is a different abnormality and not the primary mechanism of free gas bloat.