In a bloat evaluation, a lack of gas relief after passing the stomach tube points to which type?

In a bloat evaluation, a lack of gas relief after passing the stomach tube points to which type?

• A. Frothy bloat
• B. Free gas bloat
• C. Esophageal choke
• D. Normal

Answer: (A)

The key idea is how the gas is held in the rumen and whether it can be released by a stomach tube. In frothy bloat, gas is trapped in a stable foam on top of the rumen, so even after you pass a stomach tube, the distension does not relieve because the gas can’t escape from the foam. This lack of relief points to frothy bloat. In contrast, free-gas bloat involves gas that isn’t foamed over; a stomach tube will typically vent that gas and reduce the distention, since the gas can escape through the tube. Esophageal choke would usually prevent proper passage of the tube or present with different signs related to obstruction, and a normal animal would relieve gas normally if there were any distention.

The key idea is how the gas is held in the rumen and whether it can be released by a stomach tube. In frothy bloat, gas is trapped in a stable foam on top of the rumen, so even after you pass a stomach tube, the distension does not relieve because the gas can’t escape from the foam. This lack of relief points to frothy bloat. In contrast, free-gas bloat involves gas that isn’t foamed over; a stomach tube will typically vent that gas and reduce the distention, since the gas can escape through the tube. Esophageal choke would usually prevent proper passage of the tube or present with different signs related to obstruction, and a normal animal would relieve gas normally if there were any distention.